"He hit a child at the playground", "he was fighting at nursery again", "he hits his little brother" — parents say it with the same fear as "he lies": is he going to grow up aggressive? Studies that followed children from infancy to school say otherwise: by eighteen months almost all children hit, in the second and third year hitting peaks, and after that most learn to manage with words. The adult's task is not to root out aggression in one evening but to teach what will replace it — and not to miss the cases where it does not pass by itself. Below is one scene taken apart: what to find out before acting, what to choose between, what each choice leads to, and what is known about it.
The scene
A playground. A three-year-old is making a sand cake; a boy walks up and reaches for the bucket. A blow with the spade — on the arm, then on the head. The boy cries, his mother scoops him up and looks at you. Yours stands there with the spade and seems to have frightened himself.
One and the same scene is several different situations. They differ not in the blow but in age, frequency and what came before. The scene is an illustration, not a real family.
What to find out before acting
- How old is he? Before three or four, hitting is the quickest way to say "don't touch": there are no words yet, or they are slower than hands. The research below shows this is an age norm, not a character. After five or six, hitting as the main way of settling disputes is already a signal.
- Defending his own, a fight over a thing — or an attack for no reason? Defending the sand cake and hitting someone who simply walked past are different forks. The first is usually about property (see the case on a child who won't share), the second about his state.
- How often, and how hard? Once a week at the playground and every day at nursery are different pictures. A spade on the head is first about safety; a poke in the shoulder is about words.
- What does he see at home? Smacks "for educational purposes", older siblings fighting, shouting as the way to settle things — a model the child copies more precisely than any explanation.
- How are his speech and sleep? A child who cannot say it hits; a child who is under-slept or overloaded with noise and people hits twice as often. Part of "aggression" is cured by routine.
The forks: what you can do and what each one costs
If he is two or three and the blow stands in for words
Action. Stop the hand — briefly, calmly, physically: catch it, move it away. One sentence: "Stop. No hitting." First — to the one who was hit: check, comfort, apologise for your child to him and his mother — the attention goes to the one in pain, not the one who struck. Then — to your own: name the feeling and give a replacement, a word or a gesture: "you didn't want to give up the bucket; say 'mine' or show 'stop' with your palm." You will have to repeat it dozens of times: this is teaching, not punishment. Do not hit back "so he understands how it hurts": what he understands from that is one thing — the stronger one hits.
Cost. Awkwardness in front of other parents every time, and months of the same sentences without a quick result.
What to watch. Whether within two or three months a word or a gesture appears instead of the blow — at least sometimes. Whether the frequency falls as speech grows.
If the hitting is frequent, he is already four to six — or he fights at nursery
Action. Look not at the blow but at the map: when, with whom, over what — usually two or three recurring plots (a turn, a thing taken away, "they're teasing"). Agree in a calm moment on a way instead of hitting — "stop" with the hand, walk away, call an adult — and rehearse it in play. After every fight — repair, not isolation: help the one he hit, not "half an hour in the corner". With the teacher, talk not about "punish him more strictly" but about "what happens in the minute before the blow". And look honestly at home: if he is hit, he hits others.
Cost. Admitting that part of the cause may be at home, and time for conversations with the nursery that are not always pleasant.
What to watch. Frequency by weeks, not by days. Whether a pause appears before the blow — the second when he looks at you: that is the beginning of inhibition.
If he hits to cause pain, hits the weaker ones, or cannot stop himself
Action. Safety first: do not leave him alone with younger children or animals. Then a specialist, not "he'll grow out of it": a paediatrician, and if needed a neurologist and a child psychologist. The research below shows that in roughly one child in six aggression does not decline by school age, and it is exactly these children who need help early — it works better than in adolescence. At home — routine, sleep, predictability, and not a single blow aimed at him.
Cost. Admitting that home remedies are not enough — and hearing from the specialist the questions about the family that are asked of everyone.
What to watch. Whether frequency and force grow week by week. Whether he is frightened himself after a blow — that is a good sign: the brake exists and needs strengthening.
There are no ready-made lines here on purpose: every family has its own words. All three forks mean the same thing: a blow is always stopped, the attention goes to the one who was hit, and what is taught is not "don't hit" but what to do instead.
What may be behind it
- No words. At two or three the hand is faster than speech; the poorer the vocabulary, the more often the blow.
- Defending his own. "Mine" is the first thing a child is ready to defend with his body. It is not cruelty but a boundary he cannot yet mark any other way.
- Overload. Noise, crowds, tiredness, hunger — the blow comes where there is no strength left to hold back.
- Imitation. A smack at home, older siblings fighting, a cartoon where the strong one settles everything with his fists — the child copies what works for others.
- Jealousy and stress. A baby brother, a move, nursery — a blow can be a way of winning attention back. See the case on jealousy between children.
- Testing. "What happens if…?" — the same mechanism as with any rule: he reads the answer in your steadiness.
What research says
By eighteen months almost all children hit — and most learn to do without it before school
Who and on whom. Richard Tremblay and colleagues, 2004, Pediatrics. A random sample of 572 families in Quebec; mothers rated the frequency of physical aggression at 17, 30 and 42 months.
What they found. Three trajectories: about 28% of children hardly hit at all; about 58% showed rising but modest aggression; about 14% a rising high level. The authors write that by 17 months the large majority of children are physically aggressive towards siblings, peers and adults, and that most then learn alternatives before school. The high trajectory was predicted by coercive parenting already at five months, family dysfunction, low income and having younger siblings.
What it does not prove. Mothers' ratings, one province, associations rather than causes. The study does not say your three-year-old is one of the 14%: it says that hitting at this age is the rule, not the exception.
Aggression rises in the second year, peaks, and declines from the third birthday
Who and on whom. Lenneke Alink and colleagues, 2006, Child Development. 2,253 children in the Netherlands recruited at 12, 24 and 36 months; 271 of them followed for another year; ratings by mothers and fathers.
What they found. Physical aggression already occurs in one-year-olds but significantly more often in two- and three-year-olds; its frequency rises in the second year of life and declines from the third birthday onwards. At two and three, boys were more aggressive than girls; at those ages the behaviour was highly stable.
What it does not prove. Parental reports, one country. But for the scene above the conclusion is direct: three is the top of the curve, and the decline that follows is the expected course — if the child is given something to replace the blow with.
Roughly one child in six does not reduce aggression — and that goes with how they are treated
Who and on whom. Sylvana Côté, Tracy Vaillancourt, John LeBlanc, Daniel Nagin and Richard Tremblay, 2006, Journal of Abnormal Child Psychology. A nationally representative Canadian sample: 10,658 children, ten cohorts, followed for six years, ages 2 to 11.
What they found. Three trajectories from two to eleven: 31% — rare hitting in early childhood and virtually none by pre-adolescence; 52% — occasional hitting that fades; 17% — frequent and stable. The stably aggressive group more often contained boys, children from low-income families and children whose parents described their own parenting as hostile and ineffective.
What it does not prove. Associations, not causes: a difficult child also makes a parent harsher. But the direction is clear: the typical path is hitting that fades away, and hostile parenting is not a cure for aggression but its companion.
For a parent the three studies point the same way: a blow at two or three is not a diagnosis but a stage that passes in most children — if the child is taught words and gestures instead of hitting and is not hit back. And if by five or six hitting remains the main way of settling disputes, there is no need to wait: help at this age works better than later.
By age
| Age | What changes |
|---|---|
| 1–2 | The first blows are exploration of the world and a way to say "don't want". Catch the hand, a short "no", say the word for him. There is nothing to punish: the brake does not exist yet, physically. |
| 2–3 | The case above is about this age. The top of the curve: a blow instead of words, especially over his own things. Teach a word and a gesture, repeat dozens of times, attention to the one who was hit. |
| 4–6 | Blows should be getting rarer; the child is already capable of an agreed way instead of hitting and of repair afterwards. Frequent fights at nursery are a reason for a map of "when and over what", not for strictness. |
| 7–11 | Hitting as the main way of settling disputes is a signal, not a stage. Tell a fight between equals from systematic cruelty towards the weaker: the second is the case on bullying, and the roles there are different. |
Where culture comes in. "Hit back" is the norm in some families and countries; in others any blow is unacceptable; in some places boys are "supposed" to fight. The forks above do not argue with that: a blow is stopped everywhere, and what to teach instead — a word and a gesture — works in any culture.
When to see a specialist
Blows at two or three that grow rarer as speech grows are part of development. Take notice if after five or six the child fights almost every day and hitting remains his main way of settling disputes; if he hits the weaker, the younger, animals — and seems to enjoy it; if he cannot stop himself and is not frightened afterwards; if the aggression appeared suddenly alongside changes in sleep, speech or mood; if there is violence at home — including the "educational" kind. With this you go to a paediatrician and a child psychologist, not "in a year". If it is you who breaks into a blow or a shout — the case on parental anger: you will have to start with yourself.
What a child learns when he is stopped without a blow
That the strong one is the one who can stop and not hit. That the feeling "mine!" is legitimate, the hand is not, and there is a word between them. And that after a blow the world does not collapse: the one who was hit was comforted, he himself was not thrown out of the relationship but shown what to do differently. That is what grows into what adults call self-control. How to hold the rule "no hitting" without shouting or punishment — in the case on boundaries; how a blow in a tantrum differs from a blow "over his own" — in the case on tantrums.
Sources
- Tremblay R. E., Nagin D. S., Séguin J. R., Zoccolillo M., Zelazo P. D., Boivin M., Pérusse D., Japel C. Physical aggression during early childhood: Trajectories and predictors. Pediatrics, 2004, 114(1), e43–e50. doi:10.1542/peds.114.1.e43
- Alink L. R. A., Mesman J., van Zeijl J., Stolk M. N., Juffer F., Koot H. M., Bakermans-Kranenburg M. J., van IJzendoorn M. H. The early childhood aggression curve: Development of physical aggression in 10- to 50-month-old children. Child Development, 2006, 77(4), 954–966. doi:10.1111/j.1467-8624.2006.00912.x
- Côté S. M., Vaillancourt T., LeBlanc J. C., Nagin D. S., Tremblay R. E. The development of physical aggression from toddlerhood to pre-adolescence: A nation wide longitudinal study of Canadian children. Journal of Abnormal Child Psychology, 2006, 34(1), 71–85. doi:10.1007/s10802-005-9001-z
The scene is an illustration, not a real family. This material does not replace an in-person consultation with a paediatrician and a psychologist.