Developmental Trajectories of Aggression in Early Childhood

Aggressive behaviour in early childhood follows heterogeneous developmental pathways that can be broadly characterised by patterns of onset, continuity and desistence. For many children, physical aggression emerges in the second year of life, peaks between 2 and 3 years of age, and then declines as verbal skills and self-regulation capacities mature. A distinct minority, however, follow a chronic trajectory marked by stable and high levels of aggression that persist into school age and beyond. These divergent pathways are shaped by an interplay of individual characteristics—such as temperament and neurocognitive functioning—and environmental influences, including parenting style, family adversity and peer relationships. Understanding these trajectories has practical importance for early identification of at-risk children, for tailoring preventive interventions, and for informing policy decisions in education and mental health. Across cultural contexts, the global burden of conduct problems underscores the need for scalable strategies to promote prosocial skills and reduce coercive interactions during the sensitive early years.

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Developmental Trajectories of Aggression in Early Childhood publication trend

The graph below shows the total number of articles in developmental trajectories of aggression in early childhood across all publications each year (not limited to Nature Index journals).

Technical terms

Developmental trajectory: A pattern of behavioural change over time, characterised by its shape, timing and stability.

Physical aggression: Behaviour intended to harm others through physical force, including hitting, biting and pushing.

Externalising behaviour: A cluster of outwardly directed behaviours such as aggression, hyperactivity and conduct problems.

Multitrajectory modelling: A statistical approach that identifies subgroups of individuals following similar patterns across multiple outcomes over time.

Temperamental reactivity: Individual differences in emotional and behavioural responses to stimuli, evident from infancy.

References

1. Precursors to aggression are evident by 6 months of age. Developmental Science (2014).
2. Prosocial and Aggressive Behavior: A Longitudinal Study. Monographs of the Society for Research in Child Development (2021).
3. Risk Factors Associated With Boys’ and Girls’ Developmental Trajectories of Physical Aggression From Early Childhood Through Early Adolescence. JAMA Network Open (2018).