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Known risk factors for violence predict 12-month-old infants' aggressiveness with peers

Dale F Hay1, Lisa Mundy, Siwan Roberts

  • 1School of Psychology, Cardiff University, UK. haydf@cardiff.ac.uk

Psychological Science
|August 20, 2011
PubMed

Insights

Early infant aggression in 12-month-olds is linked to maternal mood disorders and conduct problems. This research identifies potential early risk factors for later behavioral issues in toddlers.

Area of Science:

  • Developmental Psychology
  • Child Psychiatry
  • Behavioral Science

Background:

  • Childhood aggression is a significant concern with potential long-term implications.
  • Identifying early risk factors for aggression is crucial for timely intervention.
  • Understanding the developmental trajectory of aggression from infancy is essential.

Purpose of the Study:

  • To test the hypothesis that infant physical force against peers is associated with known violence risk factors.
  • To investigate the relationship between early aggressive behaviors and maternal psychiatric history.
  • To determine if infant aggressiveness at 12 months can predict later behavioral problems.

Main Methods:

  • Prospective longitudinal study design.
  • Laboratory observations of 271 firstborn British infants during simulated birthday parties.
  • Correlational analysis of observed infant aggressiveness with maternal history and parent-reported infant behaviors.

Main Results:

  • No significant gender differences in infant aggressiveness were observed.
  • Infant aggressiveness strongly correlated with maternal mood disorder during pregnancy and maternal conduct problems.
  • Parental ratings of infant anger and aggression were also predicted by maternal mood disorder and conduct problems.

Conclusions:

  • Infant use of physical force is associated with maternal risk factors for violence.
  • Early identification of infants at risk for serious aggression is possible at 12 months.
  • Findings highlight the importance of maternal mental health in early childhood development and behavior.

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