Precursors to aggression are evident by 6 months of age
Dale F. Hay, Cerith S. Waters, Oliver Perra, Naomi Swift, Victoria Kairis, Rebecca Phillips, Roland Jones, Ian Goodyer, Gordon Harold, Anita Thapar and Stephanie van Goozen
Article first published online: 25 FEB 2014 | DOI: 10.1111/desc.12133
Developmental precursors to aggression are apparent in infancy. Up to three informants rated 301 firstborn infants for early signs of anger and physical force; 279 (93%) were assessed again as toddlers, as depicted in the figure. Informants' ratings were validated by direct observation of peer interaction. The precursor behaviours were significantly associated with known risk factors for aggressiveness and significantly predicted later aggressive behavioural problems.