Raising Smart Kids curriculum

Heritability estimates what share of the variation in a trait across a population tracks genetic variation. For intelligence the figure is substantial, yet researchers stress that no trait reaches 100%, so environment matters too. A heritability figure describes differences across a population. It is not a ceiling on what your own child can learn.

Twin studies put the heritability of intelligence at about 20% in infancy, 40% in adolescence and 60% in adulthood. One analysis of 11,000 twin pairs found it rising from about 40% in childhood to 60% in young adulthood. Researchers call this rise the Wilson effect. Differences between babies are far less tied to genes than differences between adults.

A leading explanation for rising heritability is genetic amplification: small genetic differences grow as children select, modify and create environments that suit them. A child who enjoys puzzles seeks out more puzzles, and the gap widens. Parents choose most of a young child's experiences, but older children increasingly choose their own.

Shared environment covers what siblings have in common, such as the same home, school and neighborhood. Non-shared environment covers what each child meets alone, such as different friends, hobbies or illnesses, plus measurement error. When you think about a child's environment, count the second kind too: each child also lives in a world you do not fully share.

Parents pass on both their genes and the home they create, so genes can act as a hidden third variable behind a parenting correlation. In one twin study, 37% of the link between household chaos and school achievement was due to shared genes. Before copying a habit from a study, ask whether the parents' own traits were taken into account.

Passive: parents provide both a child's genes and the home. Evocative: a child's traits draw out responses from other people, so a chatty child may get more conversation. Active: children seek out settings that suit them. All three mean a child's experiences are not simply handed down by parents, which helps explain why siblings raised together can differ.

Researchers checked whether home-literacy habits predicted children's reading once parents' own reading ability was controlled. Most habits no longer did, which points to shared genes. The number of books children grew up with still explained about 5% of the differences, perhaps through the value a family places on reading. One study is a hint, not a verdict.

A study that follows families as they are can describe which habits go with which outcomes. Only an experiment that assigns a change at random shows what would happen if parents did something different. When a headline says a parenting practice improves children's learning, check which kind of study it rests on before you act on it.

A polygenic score adds up many small DNA differences. For cognitive traits, its predictive power within families, comparing siblings, was about 50% lower than across unrelated people, which suggests part of the apparent genetic effect runs through the home parents create. One such score explains 12% of differences in schooling, against 40% heritability in twin studies.

Reviews of early-childhood programs, Head Start among them, find real immediate gains on cognitive tests that fade most steeply in the first years after the program ends. A strong score at the end of a program is therefore not a forecast for later grades. When you weigh an early program, look for evidence beyond its end-of-program test results.

Changes in compulsory schooling laws act as natural experiments, avoiding the problem that abler children stay in school longer. Those studies find about 2 IQ points per extra year of education. School-entry cutoff studies find closer to 5, though part of that larger gain may fade after schooling ends. It is a modest but well-tested causal effect.

Education raises measured ability, but ability also predicts staying in education longer, and family resources feed both. That is why the raw gap between people with more and less schooling is larger than the causal effect. When you read that graduates outscore everyone else, remember that part of that gap existed before they enrolled.

Researchers treat IQ, school achievement and executive function, the self-control skills of working memory, flexible thinking and inhibiting impulses, as different measures. Executive function predicts children's achievement over and above IQ and family socioeconomic status. A test score is one lever among several, and self-control skills carry their own weight in school.

In the United States, average IQ test performance rose about 3 points per decade for roughly a century, though one analysis puts it nearer 2.3, and some countries gained 7 or 8 points a decade. Gains were uneven across groups. Proposed causes include better nutrition, health and education. Old norms make a score look higher than it is, so compare scores only on current norms.

One idea holds that poverty suppresses genetic potential, so genes explain less of the differences among poorer children. A meta-analysis supported this in the United States but not in Western Europe or Australia, and a Dutch study of educational outcomes found no support. The disagreement may reflect how much each country's social policy cushions poverty.

Education researchers treat 0.20 standard deviations as a large effect in real classrooms, roughly the test gain from a year of 9th-grade learning. In one review of preregistered trials of promising secondary-school programs, the two largest effects were 0.20 and 0.23. A product promising gains many times larger is promising more than the best-tested programs deliver.

The idea started with a report that people did better on a spatial task right after hearing one Mozart sonata. Later work traced the finding to small, underpowered studies and measurement bias. Claims of lasting gains for children came afterward, along with products selling classical music on that promise. Play music because your family enjoys it.

The original effect was described as slight and transient. A leading explanation is that enjoyable music briefly lifts arousal and mood, which can help on many tasks, and one study found music and traffic noise affected performance alike. Some researchers still argue for a brief, music-specific effect in adults, so that narrow question remains disputed.

Infants who watched a word-teaching video learned none of its words, while infants taught the same words by a parent in person did learn them, even though parents rated the video as very educational. One review concludes that babies learn little from screens without an adult guiding them. Talking and playing with your baby does what the video promises.

In one experiment with 176 toddlers aged 24 and 30 months, children learned a new word from a responsive person in the room but not from a speaker on video, even a live video chat. Earlier studies found video chat more helpful, so that part is mixed. Sitting with your child during calls and repeating the new words yourself may help close the gap.

Your Baby Can Read used videos, flash cards and flap books, claimed to teach children as young as nine months, and sold for about $200 a kit, earning more than $185 million. The FTC alleged its marketers lacked reliable scientific evidence. The 2014 order banned the name and imposed judgments over $185 million, suspended after a $300,000 payment.

Lumosity claimed its games, played 10 to 15 minutes three or four times a week, would improve performance at school, at work and in daily tasks, and delay age-related cognitive decline. The FTC said the company lacked the science to back those ads. Under the 2016 settlement it paid $2 million, with a $50 million judgment suspended.

Jungle Rangers was marketed as scientifically proven to improve children's focus, memory, behavior and school performance, including for children with ADHD. It sold for $214.75 and brought in about $4.5 million. The FTC called the claims unsubstantiated, and the 2015 settlement bars them unless backed by competent and reliable scientific evidence.

Training studies consistently show near transfer: people improve on the trained task and close variants of it. Meta-analyses by Gobet and Sala find far transfer, to general thinking or school achievement, close to zero once placebo effects and publication bias are handled. Other researchers are more optimistic, so the field is divided, but broad gains are not supported.

The claim is that children learn better when lessons match their preferred style, such as visual or auditory. A 2024 meta-analysis of 21 studies found a small average benefit, but only 26% of outcomes showed the pattern the theory requires. Its authors judged the benefit too small and too infrequent to justify the cost. A learning-style quiz result is no reason to change teaching.

In a US survey of more than 3,800 people, 93% of the general public, 76% of educators and 78% of people with substantial neuroscience training agreed that people learn better in their preferred learning style. Training in education or neuroscience reduced belief in brain myths overall but did not remove it. A teacher's endorsement is not evidence.

Researchers list the 10% claim among the classic brain myths. In a large US survey, 36% of the public and 33% of educators endorsed it, falling to 14% among people with neuroscience training. Products that promise to unlock unused brain capacity rest on this myth.

Language leans on the left hemisphere and some attention functions on the right. But a brain-imaging study of 1,011 people aged 7 to 29 found no sign that some people have a stronger left or right brain overall. Labeling a child as right-brained and creative, or left-brained and logical, has no support.

The first three years are the most intensive period for picking up speech and language, and there appear to be critical periods when the brain absorbs language most easily. If they pass without exposure, later learning is more difficult. That is a reason to talk with young children often, not a reason to panic over one missed class or toy.

In a survey of 242 UK and Dutch teachers interested in neuroscience, teachers believed 49% of the brain myths on average. More general knowledge about the brain predicted more belief in myths, not less. A third to half agreed that some things can no longer be learned after a childhood window closes. Enthusiasm for brain science is no defense against myths.

CDC advises "back and forth" play with babies: when your baby smiles, you smile, and when he makes sounds, you copy them. Taking turns making sounds with an adult is among the milestones most babies reach by about 6 months. Pausing after you speak leaves room for your baby to answer.

In lab research, 9.5-month-olds who heard prompt speech responses to their babbling changed the sound patterns of that babbling. Programs that coached parents to respond this way from 6 months of age increased conversational turns and improved children's vocabulary at 18 months. What counts is answering the sound your baby just made.

Babies point to ask for things. CDC advises responding with words, such as "You want the cup? Here is the cup," and celebrating any attempt to say the word. It also suggests pointing out trucks, buses and animals yourself, which helps your baby learn to follow what other people are showing.

Joint attention means you and your child are focused on the same thing at the same moment. Naming the object right then makes the link between word and thing especially clear, and some researchers call it an ideal word-learning moment. Children who share more and longer joint-attention episodes tend to grow their vocabulary faster.

Parentese has a slower pace and higher, more variable pitch. Coaching parents from 6 to 18 months raised their parentese and conversational turns, and their toddlers' expressive language improved. Which ingredient matters most is debated: in one follow-up of 53 children, parentese at 14 months predicted pre-reading skills at age 5, while turn-taking at 6 to 24 months did not.

CDC suggests teaching more words by adding to the words your toddler already says. If she says "Dog," you might answer, "Yes, that's a dog. Dogs say woof, woof." Your reply confirms what she meant and lets her hear a longer, complete version right when she is interested.

Wh-questions allow more than one answer and draw more complex replies, while a yes-or-no question can be closed with one word. In one study of Estonian mothers and preschoolers, more wh-questions at age 4 went with stronger spoken language at that age. Looking a year ahead, what predicted later language was a more varied vocabulary and fewer commands from mothers.

Hart and Risley recorded talk in families' homes and reported that by age 4, children from families of higher socioeconomic status had heard on average 30 million more words than children from lower-income families. The figure drove wide interest in the home language environment. It is now contested, mainly over which speech around a child should count.

Hart and Risley counted only interactions involving the child, with an observer present. A recount in five US communities also counted talk from other caregivers and speech the child overheard, and found low-income children heard more speech than first reported. Defenders reply that high-quality speech directed to children, not overheard talk, is the key. Researchers still disagree about what to count.

Researchers made home audio recordings of 36 children aged 4 to 6 and measured their brain activity. Children who had more conversational turns with adults showed more activity in a left frontal area used for language, whatever their family income. The study is small and correlational, and not every later study finds turns predicting later skills, but it points toward talking with your child rather than at them.

Babies can tell different languages apart within their first days or months of life. Language disorders and delays occur at the same rates in bilingual and monolingual children, and when both languages are counted, bilingual children meet early milestones like first words on about the same schedule. Bilingualism does not appear to harm children with language or cognitive difficulties either.

Counted across both languages, bilingual infants know about as many words as monolingual peers, sometimes more. In each language alone they may know fewer, because vocabulary tracks exposure: a child who hears a language 30 percent of the time is expected to know fewer words in it than one who hears it 60 percent of the time. Comparing one language at a time can make a bilingual child look behind.

Families raise bilingual children in many ways: each caregiver speaking one language, caregivers mixing languages, or the home language inside and the community language outside. Success in each language follows how much good-quality experience the child has in it. Parents often switch languages mid-conversation, mainly to help understanding and teach words, which is a normal part of bilingual homes.

An Australian study recorded the home audio of 220 families every six months from 12 to 36 months. At 36 months, each extra minute of screen time went with 6.6 fewer adult words, 4.9 fewer child vocalizations and 1.1 fewer conversational turns. The study shows a link, not proof of cause, but turning off background TV during play protects that talk time.

CDC lists milestones most children reach by 18 months, including trying to say three or more words besides "mama" or "dada," pointing to show you something interesting and looking at a few pages of a book with you. Milestone lists are not a screening test, so if your child misses milestones or loses skills, talk with the doctor and ask about screening rather than waiting.

A meta-analysis of 19 randomized trials with children aged 1 to 6 found small effects on expressive vocabulary (d = 0.41) and receptive vocabulary (d = 0.26). Effects were larger when parents had more than 60 minutes of program contact. The biggest change was in how parents read (d = 1.01), though only five of the trials measured it.

An earlier meta-analysis found that 2- and 3-year-olds benefited much more from interactive reading than 4- and 5-year-olds. That age effect is contested: a large 2025 trial of a home program for 3- and 4-year-olds found no difference between older and younger children. Starting early is reasonable, and the trials that found benefits enrolled children from 1 to 6.

A preregistered trial with 372 English families of 3- and 4-year-olds tested a 20-minute, five-days-a-week program over 30 weeks and found no effect on language or early literacy. Families completed about 65 percent of sessions, and effects were stronger for those who did more. Another meta-analysis found small gains that were no longer significant at follow-up.

Pooled studies estimate that being read to predicts only about 8 percent of the variation in children's language, early literacy and reading achievement. Family circumstances matter too, and reading habits vary widely even among families with similar incomes. Reading together is worth doing, but a missed season of bedtime stories is not a verdict on a child's future.

While reading, an adult can point to words, run a finger under a line or ask about a letter. This is called print referencing, and it directs a child toward written language. Studies count it, along with dialogic reading, among the reading habits that support children's long-term language and literacy.

In dialogic reading the adult asks more and reads less. The PEER sequence is to prompt the child to name or talk about something in the book, evaluate the answer, expand it by repeating it with a little added information, and ask the child to repeat the fuller version. The goal is to shift the talking toward the child.

Completion prompts leave a blank for the child to fill. Recall prompts ask what happened in the book, and open-ended prompts invite the child to respond in their own words. Wh-question prompts ask what, where and why, and distancing prompts link the story to the child's own life. Mixing them keeps reading from becoming a quiz of "What's that?"

Phonemic awareness is knowing that spoken words can be broken into individual sounds, and it is a foundation for learning to read. The National Reading Panel noted that children who are read to at home, especially rhyming material, often develop the basis of it. Children who are not read to will probably need to be taught it directly.

The National Reading Panel's 2000 analysis of phonemic awareness instruction found a large effect on sound skills (0.86) and moderate effects on reading (0.53) and spelling (0.59). The effects held on tests given months after training ended. Games that ask a child to split a word into sounds or blend sounds into a word practice this skill.

Across 38 studies, the National Reading Panel found that systematic phonics, which teaches letter-sound links in a planned order, had a moderate overall effect (d = 0.44) compared with instruction that did not, such as whole-language programs. Effects were largest when phonics began in kindergarten (0.56) or first grade (0.54) and smaller in grades 2 to 6 (0.27).

Some classrooms teach multicuing, which includes guessing an unfamiliar word from the picture or its first letter. Researchers describe a strong scientific consensus that learning print-to-sound links is critical for reading an alphabetic language, and a training study with adults learning made-up scripts favored that emphasis. When your child is stuck, help them sound out the letters first.

The National Reading Panel found that guided oral reading, in which a child reads aloud and gets feedback from a skilled reader, had a consistent positive effect on word recognition, fluency and comprehension, averaging 0.41. Studies that simply encouraged independent reading had not shown a clear benefit. Listening to your child read and helping with hard words is the practice that was tested.

A meta-analysis found that the correlation between print exposure and oral language skills such as vocabulary and grammar rose from 0.34 in preschool to 0.66 in college. Shared reading, and later independent reading, is one of the main forces behind differences in children's oral language. Keeping books in family life after the picture-book years matters.

In a US study of more than 8,000 young adolescents with brain scans and cognitive tests, more reading time went with higher cognitive scores and larger surface area in some brain regions, even after accounting for family income. More TV time had a much smaller link in the opposite direction. The authors caution that an observational study cannot show cause.

In a lab study of 37 parent-toddler pairs reading electronic and print books, both parents and toddlers said less and collaborated less with the electronic books. It is one small study, but for toddlers it favors print books when the goal is conversation about the story.

A meta-analysis of e-books found that preschoolers and kindergartners benefited from multimedia features, such as animations and sound effects, that play along with the story narration. Interactive hotspots and games that a child taps tended to distract from the story. If you use e-books, choose ones whose extras serve the story.

Researchers place guided play between free play and direct teaching. The adult sets up a playful activity with a learning goal in mind, the child keeps choice and leads where possible, and the adult adjusts with open-ended questions, hints and modeling in response to the child's interests.

A 2022 meta-analysis of 17 studies with 3,893 children aged 1 to 8 found guided play outperformed direct instruction on early math (g = 0.24), shape knowledge (0.63) and task switching (0.40), with no difference on other outcomes. Nearly all of the studies carried a high risk of bias and there were signs of publication bias, so the gains are promising, not proven.

A 2022 meta-analysis found that guided play beat free play on spatial vocabulary, the words for position, shape and size, with a large effect (g = 0.93). Like its other results, this rests on studies rated at high risk of bias. Guidance can be as light as naming where pieces go while a child builds.

If a child starts building a circus from blocks and a parent steps in to declare that the animals live at a zoo, researchers call that co-opted play: it redirects the child's idea and takes away some of her agency. Guided play keeps the child in the lead while the adult supports.

In a well-known experiment, a knowledgeable adult demonstrated some of a new toy's functions, while in another condition an adult seemed to stumble on one by accident. Children who were taught directly explored less and found fewer of the toy's other features. Researchers call this the double-edged sword of teaching: efficient, but it can cut discovery short.

A 2025 study of 148 preschoolers aged 4 to 6 revisited the toy experiment. Exploration was limited only when an adult demonstrated the toy's use. When children found a feature themselves and the adult then highlighted it, they kept exploring. The result refines the earlier finding: teaching and exploring can work together if the child discovers first.

In one study, 11-month-olds saw objects appear to pass through a solid wall or vanish. Afterward they learned more about those objects and spent more time exploring them, even banging an object that had seemed to pass through a wall, as if testing it. When something surprising happens, give your child time to investigate.

Studies of children's questions find that preschoolers seem less satisfied when a "why" gets a non-answer, such as the question restated or a personal reaction, than when it gets a real explanation. Weak answers tend to send children exploring for more. A short, true explanation at the child's level serves better than "Because I said so."

Observational research has recorded children asking questions at a rate of more than 100 per hour. Even young children change their beliefs based on the answers they get, and curiosity helps focus their attention on the information they want. Children ask less when questions do not feel welcome, so treat the stream as a good sign.

In one longitudinal study, parents' promotion of curiosity in early childhood was linked to more intrinsic motivation for science years later and higher science achievement in high school. Ways to encourage it include giving children chances to figure things out, valuing the exploring over the right answer, and showing your own curiosity by looking things up together.

CDC advises taking time to answer a preschooler's "why" questions. When you do not know the answer, it suggests saying so and helping your child find it in a book, online or from another adult. That shows your child how people find things out, which a confident guess does not.

Researchers following US children found that higher curiosity went with higher reading and math achievement in kindergarten, and the benefit was larger for children facing socioeconomic disadvantage. In this research, curiosity is rated by parents and the findings are correlational, but they suggest curiosity is worth protecting rather than shushing.

In a study of about 5,100 US children, more hours of daily TV in preschool were linked to lower parent-rated curiosity at kindergarten. Children whose parents often talked with them while watching were rated more curious, and that link was strongest in lower-income families. Watching together and chatting about the show is the habit that went with more curiosity.

A review of pretend play research found links with language, storytelling and emotion regulation, but little direct evidence that pretending causes those skills; children with stronger skills may simply pretend more. The same held for reasoning and social skills. This is contested, and unproven is not the same as useless: pretend play still has value as play.

Across five 90-minute home observations when children were 14 to 30 months old, some parents said more than 200 number words while others said fewer than 10. How often parents talk about numbers and space in early childhood predicts both current and later math skills. Counting stairs, snacks and toys out loud adds up.

Experiments that had parents read number books or weave math talk into play improved children's number skills. A meta-analysis of 12 studies found the amount of number talk correlated only modestly with parent education (r = 0.12) and family income (r = 0.14). The bigger story is how widely individual families differ.

In one study of 44 families, parents' number talk about objects that were present, in sets of 4 to 10, predicted children's later knowledge of what number words mean. Counting the six apples in a bowl gives a child the number word and the amount it stands for at the same moment.

A systematic review of 37 studies found a real positive association between home number activities and children's math skills. Advanced activities, such as simple sums, were linked to skills while basic ones, such as counting, were not, and some studies of number games found no effect. Moving from reciting numbers to using them seems to be what counts.

Understanding that the final number in a count gives the total size of a set is called the cardinality principle. It underpins comparing quantities and early arithmetic, and it influences later school math. A child who counts to 20 but starts over when asked how many is still building it, so after counting, ask how many there are.

CDC lists counting to 10 and naming some numbers between 1 and 5 when you point to them among the milestones most children reach by age 5, along with using time words like yesterday and tomorrow. If your child is not meeting milestones or has lost skills, CDC advises talking with the doctor early.

Playing a board game with squares numbered 1 to 10 from left to right, for four 15-minute sessions, improved young children's number identification, number-line estimation and comparison of which number is bigger. A version with colored squares instead of numbers produced smaller gains. Moving a token farther for bigger numbers ties number words to amounts.

When researchers compared a linear 1-to-10 board with a circular one, children who played the linear version made larger learning gains. The researchers think a straight track better matches the mental number line children use to picture quantities. A homemade number track works best laid out in a line.

A meta-analysis of 217 training studies found an average gain of g = 0.47 over control groups, though only 53 involved children under 13. A later meta-analysis of 20 studies with children up to age 8 reported a larger average, g = 0.96, but study design quality affected results, so the true size for young children is uncertain.

Boys tend to spend more time with spatial toys and activities, partly because toys stereotyped for boys tend to be more spatial. Meta-analyses suggest girls and boys benefit similarly from spatial training and activities, though single studies disagree on whether one sex gains more. Offering blocks, puzzles and building sets to every child keeps the practice even.

Puzzle and block play are positively associated with children's spatial skills, though these are correlations. In one home-observation study, boys and girls did puzzles equally often, and the quality of their puzzle play was linked to spatial skill for girls but not for boys. A puzzle that is a little hard, with you nearby to talk, is a cheap spatial workout.

In one study of 3-year-olds, accuracy at copying block structures explained 15 percent of the differences in their math performance, and similar links appear in older children. Some trials suggest block-building practice improves early math, especially for children from lower-income families, but others found no clear benefit.

Some studies link parents' math anxiety to weaker math performance in their children, possibly only when anxious parents are heavily involved in homework and show negative emotions while helping. Other studies link it to children's math anxiety but not their scores, and one found the reverse. If math makes you tense, keep the mood around homework calm.

In a UK study of twins, boys rated their own math ability higher than girls did, and actual ability explained only a small part of that gap. Parents' ratings of their children's math ability showed the same gender bias and explained 23 percent of the gap, even accounting for real ability. The authors call this suggestive evidence that parents pass on math stereotypes.

In lab lessons on equations such as 4 + 6 + 3 = ? + 3, school-age children who learned a strategy with hand gestures handled new problem formats better than those taught with actions alone, and groups that gestured kept what they learned for at least four weeks. Using your hands to show which numbers go together can help when you explain math.

Working memory holds and uses information in mind, inhibitory control stops an automatic response, and cognitive flexibility shifts between rules. Researchers find these skills can change and that they predict school achievement beyond IQ and family socioeconomic status. A child who forgets steps or melts down when rules change is showing where these skills are still growing.

Early studies linked how long preschoolers waited for a second treat with later achievement. A larger 2018 replication found a weaker link that largely disappeared once early social environment and demographic factors were taken into account. Researchers now debate what the test really measures, so one short wait at age 4 is no forecast.

Patience is more changeable than once assumed. In one study, children sat stiller and talked to themselves less when an adult was in the room, and other work links waiting to how stable a child's surroundings are. Keeping your own promises about later rewards gives waiting a reason to pay off.

A meta-analysis of 41 studies of children up to age 8 found that positive parenting correlated about .25 with executive function, cognitive support such as scaffolding about .20, and controlling or intrusive parenting about -.22. These are moderate correlations, not proof that the parenting caused the differences.

Sensitive caregivers notice a child's cues and respond in ways that may give the right amount of support during learning, which researchers call scaffolding. Across 473 studies with 86,625 participants in 35 countries, caregiver sensitivity went with better development in many areas. In practice that means a hint or a question while your child works, not placing the puzzle pieces.

Most research linking parenting and child development is correlational, so it cannot show cause. Stronger evidence comes from trials in which programs raised caregivers' sensitivity and children's outcomes then changed. When you weigh parenting advice, give more weight to claims backed by such trials than to surveys of families.

Homes tend to be less chaotic for children with high effortful control. One analysis found that the same parental genes that shape household order and routine are passed to children and contribute to their self-control. Routines may still help, but evidence of this correlational kind cannot show that they do.

A randomized trial in 29 schools, 79 classrooms and 759 children tested Tools of the Mind, which builds self-regulation into literacy, math and science activities. It found gains in executive function, attention, reading, vocabulary and math that grew into first grade. Several effects were specific to high-poverty schools, and the result comes from a single trial.

An early, smaller study of the Tools of the Mind preschool curriculum reported executive function gains, but five later randomized trials found none, and math improved in two of the five trials that measured it. A large national Head Start trial found no executive function effects from any of three approaches. The evidence across ages is mixed.

A review of 15 years of large preschool trials found that effects on executive function, when present, tend to be small and hard to interpret over the long term. Training children directly was not the only route, or perhaps the most effective one: changes in how teachers managed classrooms also helped. Everyday adult support counts, not only special drills.

A randomized trial of a box of 31 short games aimed at focus, memory and stopping to think ran in 36 pre-K to 4th-grade classrooms with 626 students. Results on teacher-rated behavior were marginal or mixed, with no effects on direct tests of inhibitory control or working memory. Games like these can be fun, but evidence that they change the skills is weak.

Training studies show near transfer, improvement on the trained task and close variants, even when placebo effects are controlled. Broader gains are close to zero, and reviewers suggest aiming at near transfer instead. If the goal is starting homework on time, practicing that routine is more promising than an abstract memory game.

Person praise credits a fixed trait, as in calling a child clever, and can suggest that ability is beyond the child's control. Process praise credits effort and approach, suggesting success can be earned. After a good test, try naming what your child did, such as checking each answer, rather than calling them a natural.

In an online survey of 300 parents, those who held more fixed beliefs about ability were more likely to use controlling, performance-focused behaviors, while those who did not used more autonomy-supportive, mastery-focused ones. It is one correlational study, but it is worth checking your own beliefs when you feel the urge to take over homework.

In long-term home studies, parents who gave more positive feedback on effort to children aged 14 to 38 months had children who showed more persistence at 7 to 8, and toddlers who received process feedback later held more of a growth mindset. These studies are correlational, so they show a link, not proof that the praise caused the beliefs.

Feedback that comments only on the result leaves a child who fails searching for a cause, and they may conclude they are simply not smart enough. Feedback about the process gives them something they can change next time. Asking what your child tried, as well as what they got, keeps attention on what is in their control.

Several studies found that parents who saw failure as debilitating more often had children with a fixed mindset, while those who saw it as a chance to learn more often had children with a growth mindset. Links between parents' own mindsets and their children's are inconsistent, so this area is unsettled. Your reaction to a failed quiz may teach more than a poster.

Inflated praise uses words like incredibly or amazing, as in telling a child they did incredibly well rather than well. Roughly 25% of praise is inflated. Children may hear it as a demand to keep performing exceptionally, which can make trying something new feel risky. Modest praise acknowledges the performance without setting that bar.

In a virtual-reality experiment with 202 children aged 8 to 12, parents gave modest praise, inflated praise or none. Modest praise helped children with lower self-esteem explore new ways to succeed after failing; inflated praise did not. For children with higher self-esteem, modest praise slightly reduced exploration. The effects were small.

In one experiment, 63 children aged 10 to 13 judged a classmate given inflated praise to be less smart, though more hardworking, than one with the same result and modest or no praise. In another, 106 teachers gave more inflated praise to children from low socioeconomic status backgrounds. Gushing over one sibling's average grade can send a message you did not intend.

In a national experiment with 12,490 students in 65 schools, an online program under an hour long, teaching that ability can grow, raised lower achievers' core grades by 0.10 points, an effect size of 0.11, with no grade effect for higher achievers. Effects held where peer norms backed the message. The gain is real but modest.

One meta-analysis found an effect size of 0.14 for targeted students in well-run programs and 0.04 for everyone else. Another concluded that effects on grades may be rare or even spurious once study quality is considered. Expect at most a small effect, mostly for targeted groups such as students with low grades, and be wary of claims of large gains.

About 88% of US teachers say growth mindsets are important for student outcomes, and a small industry sells mindset programs to schools. That popularity has run ahead of research that finds small and uneven effects. A school's growth-mindset slogan tells you about its culture, not about proven results.

A large meta-analysis of children averaging about 13 found that warmth and autonomy granting correlated .14 and .11 with academic achievement, while psychological control and harsh control correlated -.11 and -.16. The links are small and do not prove cause, but controlling pressure shows no sign of paying off in grades.

A meta-analysis of 128 experiments found that expected tangible rewards, such as prizes promised for doing a task, tended to undermine intrinsic motivation. Verbal praise and positive feedback tended to increase it, and unexpected rewards did no harm. Paying a keen reader per book risks turning reading into a job.

Some researchers argue the undermining effect can be avoided and that rewards may even raise interest. One study with young adults found that a bonus given right after a task increased their intrinsic motivation. For a chore a child has no interest in, a simple reward chart has little enthusiasm to undermine.

CDC lists 14–17 hours a day for newborns, 12–16 for babies 4 to 12 months, 11–14 for ages 1–2, 10–13 for ages 3–5, 9–12 for ages 6–12 and 8–10 for teens 13–17. Naps count toward the total through the preschool years. Treat the ranges as a guide, and talk with your child's doctor if sleep is regularly a struggle.

CDC links insufficient sleep in children and teens to attention and behavior problems, and through them to poorer academic performance. Short sleep is the norm: in CDC's 2025 data, 75% of students were not getting enough. Before treating slipping grades as a motivation problem, check how much your child actually sleeps.

The federal guidelines also ask for vigorous, muscle-strengthening and bone-strengthening activity, each on at least 3 days a week. Children aged 3 to 5 should be active throughout the day, and about 3 hours of play at any intensity is a reasonable target. When the guidelines were published, only 20 percent of adolescents reported meeting them.

A 2018 federal advisory review found moderate evidence that activity helps thinking before adolescence and inconsistent evidence during it. A 2020 appraisal of 19 systematic reviews rated only one as high quality and found small effects, around 0.1 to 0.3, with mixed results for school achievement. Keep your child active for health, not as a route to better grades.

Iron supports brain development, and CDC notes that infants and children with iron deficiency anemia may develop learning difficulties. Iron needs differ for breastfed, formula-fed and preterm babies, and iron-rich foods matter once solids start around 6 months. Ask your child's doctor whether your baby needs extra iron rather than deciding on your own.

A 2026 review of 17 systematic reviews found small cognitive benefits from iron supplements in children with anemia, but negligible or uncertain effects in children who were not deficient, and no consistent gains in school achievement. Iron corrects a deficiency; it is not a learning aid. Your child's doctor can check whether it is needed.

CDC links even low blood lead levels to developmental delays, difficulty learning and behavior problems. Children under 6 are most exposed because they put hands, toys and dirt in their mouths. Common sources are chipping paint in buildings from before 1978, water from lead pipes, soil near highways or factories, and some imported candies, toys and traditional medicines.

Since October 2021 CDC has used 3.5 micrograms per deciliter, down from 5.0, set at the 97.5th percentile for US children aged 1 to 5. CDC says it is not a health-based standard or a toxicity threshold. A result below it does not mean a child is free from harm, so finding and removing the lead still matters.

If your child may have been exposed, CDC advises asking the child's healthcare provider about a blood lead test, especially if you live in a home built before 1978. Children enrolled in Medicaid must be tested at 12 and 24 months, and between 24 and 72 months if never tested. A finger-prick result above the reference value may be confirmed with a blood draw from a vein.

Researchers combined data on 1,333 children followed from birth or infancy to ages 5 to 10. A rise in blood lead from 2.4 to 10 micrograms per deciliter went with about 3.9 fewer IQ points, while the next steps, 10 to 20 and 20 to 30, cost 1.9 and 1.1 points. Small exposures are not trivial, which is why prevention comes first.

In a UK study of 7,855 children followed to age 14, accounting for family socioeconomic position explained about half of the link. Adding mothers' own cognitive scores left no significant link at age 5 and only small verbal differences at later ages. The researchers judged any real effect modest, so families who could not breastfeed should not read it as lost ability.

PROBIT randomly assigned 31 hospitals in Belarus to promote breastfeeding or continue usual care, enrolling 17,046 infants. At 6.5 years the promotion group scored higher on verbal IQ; at 16 there was no overall difference, only a 1.4-point verbal edge. Studies comparing siblings have given conflicting results, so the true effect is still debated.

CDC passes on the American Academy of Pediatrics advice that toddlers younger than 18 months not use screen media other than video chatting, and suggests a family media plan. A video call with a grandparent fits that advice; a show playing in the background does not.

Children under 3 often struggle to carry what they see on a screen over to real life, a gap called the video deficit. In one small study of 2-year-olds, parents describing a tablet video improved recall over watching without that support, but a live demonstration worked better still. Watch with your child, talk about what you see, and favor real people and objects.

Adverse childhood experiences include abuse, neglect, violence, and growing up with household substance use or mental health problems. CDC reports that 3 in 4 US high school students had at least one and 1 in 5 had four or more. Safe, stable, nurturing relationships and environments help keep these experiences from happening.

Since the February 2022 revision, each milestone sits at an age by which at least 75% of children are expected to show it. CDC chose that placement so that even one missed milestone prompts action instead of waiting to see. A milestone set at 50% would still be missing in half of all children.

CDC describes its checklists as communication tools, not developmental standards, and says they should not be used to detect delays. If a concern comes up, the next step is screening and evaluation with formal tools, or a referral for services.

Checklists and CDC's Milestone Tracker app help you follow milestones over time, but they do not replace standardized, validated screening tools. The American Academy of Pediatrics recommends general developmental screening at 9, 18 and 30 months and autism screening at 18 and 24 months, or whenever a parent or provider has a concern.

CDC advises acting early if a child is not meeting one or more milestones, has lost skills they once had, or worries you for another reason. Talk with your child's doctor and ask about developmental screening. If either of you is still concerned, ask for a referral to a specialist and call your state's early intervention program.

CDC reports that 1 in 5 children aged 3 to 17 have a developmental disability and estimates that 1 in 31 eight-year-olds have autism. Disabilities are even more common among children from low-income households. Ongoing monitoring together with screening gives the best chance of finding a delay early.

Early intervention is the name for publicly funded services, such as speech, physical and occupational therapy, for young children with developmental delays or disabilities and their families. Each state and territory runs its own program with its own rules, and eligibility rests on an evaluation of the child's skills.

Under age 3, call your state or territory's early intervention program and say you would like your child evaluated. From age 3, call any local public elementary school, even one your child does not attend, and ask for an evaluation for preschool special education. If the person answering is unsure, ask for the special education director.

The initial evaluation, the assessments of child and family, and the first Individualized Family Service Plan meeting must all be finished within 45 days of the referral. The clock can pause only for documented family circumstances or while a parent has not given consent. Note the date you called, and ask about it if the process stalls.

Michigan's Perry Preschool participants had more education, earnings and employment into their 40s, and 12% more finished high school by 40; one estimate put the return at $12.90 per $1. North Carolina's full-day Abecedarian Project, from birth to 5, was linked to higher earnings and better health, though its graduation gap, 70% versus 67%, was not significant.

Perry is estimated to cost about $20,000 per child per year in current dollars and Abecedarian $16,000 to $40,000, against a US average of $5,374. No publicly funded program has fully replicated either. Their results show what intensive programs achieved, not what any preschool will deliver.

The national Head Start Impact Study randomly assigned applicants at 383 centers in 23 states to a year of Head Start or not, then followed them through third grade. Children gained in several areas by the end of the year, but most differences had faded by early elementary school. Dual-language learners and children who started with lower skills showed larger, longer-lasting gains.

They started kindergarten ahead but performed worse on a broad range of measures through 6th grade. One researcher blames academic, whole-group teaching in public-school pre-K; a national survey of 2,664 teachers found public programs reported more developmentally appropriate practice and fewer worksheets than private ones. The cause is unresolved, so judge a program by its classrooms.

A large NICHD study of more than 1,000 children found positive caregiving among the strongest and most consistent predictors of development. Ratios, group size and caregiver training set the stage for it. When you visit a program, watch how the caregivers talk and play with the children, not only what the curriculum promises.

In the same NICHD study, children cared for only by their mothers did not develop differently from those also cared for by others. Higher-quality care went with somewhat better language and thinking skills, and more hours with somewhat more behavior problems. Parent and family characteristics were more strongly linked to development than child care features.

A 2023 review of 20 studies with 16,338 students found that supportive help, especially help that leaves the child in charge, went with slightly higher math scores (r = 0.08), while controlling or taking over went with lower ones (r = −0.15). These are small correlations, not experiments. The useful shift is supporting how your child works rather than doing the work.

Researchers separate structure, meaning routines and clear expectations, from control, meaning pressure and stepping in uninvited. Among 335 German fourth graders followed from autumn to winter, children who reported more parental control later had lower grades, and lower grades were followed by more control. Studies that measure both find the quality of homework help matters more than the amount.

Long-running reviews found that time spent on homework correlated about 0.07 with achievement in middle school and 0.25 in high school. A 2024 review found a handful of experiments, mostly in primary-school arithmetic, where doing homework beat doing none, but results varied widely. How many minutes a young child needs each night remains an open question.

Across studies run before the pandemic, literacy tutoring averaged an effect of 0.35, roughly moving a child from the 50th to the 64th percentile. Effects were largest in preschool and kindergarten (0.50) and smaller in grades 2 to 5 (0.22). Teachers and trained aides beat volunteers or parents, and more sessions generally helped.

A review of 54 studies with 6,984 children found small gains only in studies that lacked both random assignment and an active comparison group; with random assignment the effect was near zero. The authors argue that other researchers' optimism rests on weaker designs, so the question remains contested. Music is worth learning for its own sake.

Earlier studies linking chess to better math mostly lacked a fair comparison group. In a test with 233 third and fourth graders, children taught chess for 25 hours did no better at math problem solving than children who played checkers or had no lessons. Chess is a fine hobby to choose for enjoyment, not a math shortcut.

Chess players score about half a standard deviation higher on cognitive tests, but that is a correlation, not proof chess caused it. In training studies, music lessons beat doing nothing by 0.25 standard deviations yet beat another activity by only 0.03, which suggests placebo-like effects rather than real transfer. Skills mostly grow where they are practiced.

Acceleration lets a student move through material faster or earlier, including skipping a grade. A 2016 meta-analysis found accelerated students outperformed non-accelerated peers academically while showing equal or better social and emotional adjustment. Good outcomes depend on fit, and only about 30% of US schools use acceleration regularly, so ask how your school decides.

Children from disadvantaged backgrounds are less likely to be tested for gifted programs in the first place, and formal assessments find students that teacher nominations miss. Researchers recommend screening every student rather than waiting for referrals. If your school tests only referred children, it is fair to ask whether it could screen everyone.

A review of 32 studies found that being young for the school year was linked to a higher chance of an ADHD diagnosis (relative risk 1.38) and of ADHD medication (1.28). The age effect appeared in teacher ratings of symptoms but not parent ratings. If a teacher raises attention concerns about one of the youngest in the class, ask how the child compares with same-age peers.

In two studies, children who were oldest in their year because they had been held back were more likely to get ADHD medication than younger classmates who started on time, possibly because they already had more complex needs. Wealthier families are also more able to delay entry. The review's authors conclude that changing school-entry rules may not reduce the youngest-child effect.

Classmates can be up to 12 months apart in age. A study of over four million French children aged 5 to 10 found December-born children, the youngest in their grade, were 64% more likely to start speech therapy than January-born ones. The authors suggest relative immaturity may sometimes be mistaken for a learning disorder.

About 10% of US students repeat a grade between kindergarten and eighth grade. In Florida, third graders held back with extra reading help outscored promoted same-age peers by 0.31 standard deviations in reading three years later, but the edge faded within five years. Holding back low-achieving eighth graders raised later dropout.

A study following 2,716 Australian students from grade 3 to grade 9 found that in primary school, reading achievement predicted later enjoyment more than the reverse. By secondary school the direction flipped, and enjoyment in grade 7 predicted achievement in grade 9. The authors call the evidence for the flip marginal, but the pattern suggests keeping reading for fun alive as children grow.

Academic socialization means linking schoolwork to a teen's goals and future, as distinct from helping with homework. Earlier research reports it has the strongest link with engagement among forms of parental involvement in adolescence. A one-time survey of 614 Ethiopian high school students found it predicted engagement, partly through students' confidence in their own ability.

In a 2023 review of 20 studies, the negative link between intrusive homework help, meaning control and interference, and math achievement was strongest in high school, weaker in middle school and weakest in primary school. The pattern is correlational, but it suggests easing off close supervision as children reach high school.

Self-determination theory treats these as opposite styles: psychological control pushes children to comply with the parent's expectations, for example by making them feel guilty, while autonomy support encourages self-initiation and explains rules. In a study of 310 Chinese teens around age 13, teens reported more control and less autonomy support than their parents did.

Self-determination theory holds that motivation rooted in interest and values depends on three needs: autonomy, competence and relatedness. A review of 144 studies with more than 79,000 students found competence predicted that motivation most, then autonomy, then relatedness, and teachers' autonomy support mattered more than parents'. Helping a teen feel capable in a hard subject targets the strongest of the three.

In puberty, teens become sleepy later at night and need to sleep later in the morning. In 2014 the American Academy of Pediatrics recommended that middle and high schools start no earlier than 8:30 a.m. In the 2011–12 school year the average US public middle or high school started at 8:03 a.m., and only about one in six started at 8:30 or later.

The American Academy of Sleep Medicine recommends 8 to 10 hours per 24 hours for ages 13 to 18 and 9 to 12 hours for ages 6 to 12. CDC reports that in 2025 data, 75% of students were not getting enough sleep. Late bedtimes combined with early school start times leave most teens short.

Teens exposed to more evening light, including light from electronics, are less likely to get enough sleep, and phones, computers and games may push bedtimes later. CDC suggests a media curfew or keeping these devices out of the bedroom, and notes that teens with parent-set bedtimes usually sleep more than those without.

At a French boarding school, classes of students around age 13 were randomly kept at an 8 a.m. start or moved to 9 a.m. After six months the later group slept 26 minutes more, felt less sleepy and did better on a self-control task. The time students fell asleep did not differ, so the extra sleep came in the morning. About 50 students had their sleep measured.

Up to 95% of US 13- to 17-year-olds use social media, more than a third almost constantly. The advisory cites a study of 6,595 teens in which more than 3 hours a day went with double the risk of depression and anxiety symptoms, an association rather than proof of cause. It advises keeping phones and tablets away for at least an hour before bed and through the night.

Reviews report small or negligible average links between social media use and well-being, and experiments are mixed. A UK study of 17,409 young people found ages when heavier use predicted lower life satisfaction a year later: 11 to 13 and 19 for girls, 14 to 15 and 19 for boys. Lower life satisfaction also predicted more use. How much harm there is remains contested.

Jean Twenge, Jonathan Haidt and colleagues argue that analyses lumping all screen activities, boys with girls, and light with heavy use make real associations look trivial. In data they highlight, about twice as many heavy as light users were depressed, especially girls. The researchers they critique had reported no meaningful link in time-diary data, so the debate remains open.

Among 5,227 students, those who opened an account in grade 6 scored about 0.22 standard deviations lower in Italian and 0.18 lower in math by grade 8 than students who waited until grade 9 or later. Phone use before sleep, on waking and during homework explained part of the gap. It is one region and one design, so it is a signal to weigh, not settled fact.

A meta-analysis reported correlations of 0.34 with current and 0.41 with later achievement for parents' expectations of success. The link runs both ways, since a child's results also shape what parents expect, and high expectations were not sufficient on their own for any social group.

A federal practice guide recommends returning to key material several weeks to months after first learning it, and using quizzes that make students recall answers, with feedback. In classroom studies, quizzed facts were remembered better on unit tests than facts that were simply reread. For a teen, quizzing across several weeks fits that advice better than one session the night before.

Learning disabilities have no cure, but NICHD says early intervention can lessen their effects and that getting help earlier raises the chance of success in school and later in life. Left untreated, they can lead to frustration and low self-esteem. If a teacher suggests waiting, you can still ask about an individual evaluation.

NICHD states that having one or several learning disabilities is not related to intelligence; it means the brain works differently. With the right interventions, many people with learning disabilities read, write, speak and calculate as well as or better than others. Worry about a label is not a good reason to skip an evaluation.

Other signs NICHD lists include delayed speech, difficulty learning songs and rhymes, slow reading, giving up on longer reading tasks and trouble remembering numbers in sequence. Signs alone are not enough; only a professional can diagnose a learning disability. A bright, talkative child can still have dyslexia.

In response to intervention, schools monitor every student and move those making too little progress into tiers with more support. A struggling student can also have an individual evaluation, which can identify a learning disability, decide eligibility for special education and shape an IEP. A full evaluation includes a medical exam to rule out other causes.

NICHD says reading disorders have no single known cause: genes may play a part, and so do experiences such as classroom teaching and whether a child was read to as a preschooler. Intensive instruction from specially trained teachers works best, and earlier help brings better results. With proper instruction, people with reading disorders can learn to read.

A definition used by many UK assessors calls dyslexia a continuum with no clear cut-off that occurs across a range of intellectual abilities. A 2025 consensus of 58 experts added genetic and environmental influences and made family history a key indicator. Diagnostic manuals disagree about comparing reading with IQ: ICD-11 does, while DSM-5-TR compares it with age and schooling.

Under IDEA, a specific learning disability can affect listening, thinking, speaking, reading, writing, spelling or math, and dyslexia is listed among its examples. Problems caused mainly by vision, hearing or motor disabilities, intellectual disability, emotional disturbance, or environmental, cultural or economic disadvantage do not count, so an evaluation looks at those too.

Language disorders affect understanding or expressing ideas; speech disorders affect producing sounds or talking fluently, as in stuttering. Some children with developmental language disorder do not start talking until their third or fourth year. If you are concerned, talk to your child's doctor, who may refer you to a speech-language pathologist.

About 2 or 3 in every 1,000 US children are born with detectable hearing loss, and about 98% of babies are screened before 1 month. After a failed screen, see a pediatric audiologist, ideally by 2 to 3 months, and start services by 3 to 6 months if loss is confirmed. Hearing can change later, so keep watching speech and listening milestones.

ADHD is a neurodevelopmental disorder marked by inattention, hyperactivity and impulsivity, in any combination. Everyone shows these behaviors sometimes; in ADHD they happen often, at school, at home and with friends. It commonly occurs alongside learning disorders, sleep problems, anxiety or depression, which can make it harder to diagnose.

Diagnosis takes several steps, starting with your child's healthcare provider, and includes a medical exam with hearing and vision tests. A pediatrician, psychologist or psychiatrist can diagnose ADHD after hearing about behavior at home, at school and with peers. Early intervention (under 3) or your school system (3 and older) can also evaluate a child at little or no cost.

CDC relays American Academy of Pediatrics guidance: under age 6, start with parent training before trying medication; from 6, combine medication with behavior therapy. Stimulants leave 70–80% of children with ADHD with fewer symptoms but can cause side effects such as decreased appetite and sleep problems. Medication decisions belong with your child's healthcare provider.

An Individualized Education Program falls under the Individuals with Disabilities Education Act and delivers special education tailored to the child. A Section 504 Plan, under the Rehabilitation Act, adds services and changes so the child can learn as well as other students. Parents report that children with ADHD more often have an IEP (42.9%) than a 504 plan (13.6%).

Accommodations can include extra time, breaks, fewer distractions and help staying organized. CDC notes that there is limited information on which types work. Clear expectations, immediate positive feedback and a daily report card shared between school and home have some supporting evidence, so ask about those alongside extra time.

Either a parent or the school may request an initial evaluation to decide whether a child has a disability under IDEA. Once a parent consents, the evaluation must be completed within 60 days, or within the state's own timeframe if it sets one. Note the date you gave consent so you can track the deadline.

Twice-exceptional children may be seen only as gifted, only as disabled, or as typical, because strong reasoning can mask weak skills. In one study of 150 Greek students, gifted students with learning disabilities had decoding and fluency problems like dyslexic peers but stronger comprehension. Identification is still disputed, so ask for an evaluation that looks at both.