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Updated: Feb 2, 2026

Boldness, Aggression, and Shoaling Assays for Zebrafish Behavioral Syndromes
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Normative Trends in Physically Aggressive Behavior: Age-Aggression Curves from 6 to 24 Months.

Michael F Lorber1, Tamara Del Vecchio2, Amy M S Slep1

  • 1Department of Cariology and Comprehensive Care, New York University, New York, NY.

The Journal of Pediatrics
|November 16, 2018
PubMed
Summary

Physically aggressive behaviors are common in children under two years old. While most forms increase with age, some, like hair pulling, decrease, offering insights for pediatric guidance.

Keywords:
aggressionchild behaviorchild developmentinfancytoddlerhood

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Area of Science:

  • Child Psychology
  • Developmental Pediatrics
  • Behavioral Science

Background:

  • Physically aggressive behaviors are observed in young children.
  • Understanding age-related trends is crucial for early intervention and parental guidance.

Purpose of the Study:

  • To investigate age-related trends in physically aggressive behaviors in children aged 6 to 24 months.
  • To identify specific behaviors that increase or decrease with age in this developmental period.

Main Methods:

  • A normative US sample of 477 mothers reported on the frequency of 9 physically aggressive child behaviors.
  • Data were analyzed using 2-part regression models to assess age-related trends.

Main Results:

  • Nearly all children (94%) exhibited physical aggression in the past month.
  • Kicking, pushing, and swiping prevalences increased with age.
  • Hair pulling prevalence decreased with age, while hitting and throwing showed a more complex pattern, increasing then decreasing.

Conclusions:

  • Physically aggressive behavior is nearly ubiquitous in 6- to 24-month-olds.
  • Most forms of physical aggression increase with age during this period.
  • Findings can inform pediatricians in counseling parents about child behavior.