Social competence with peers of 55 (27 girls) children was examined fr
om ages one to nine. rn the toddler and preschool periods, social comp
etence with peers was observed and rated by independent observers and
rated by teachers. Teachers reported on children's social competence w
ith peers at age nine. Children who engaged in move complex play with
peers as toddlers were more prosocial. engaged in complex play, were l
ess withdrawn as preschoolers, and were less aggressive and withdrawn
as nine-year-olds. Children who were more aggressive and withdrawn as
preschoolers were more aggressive as nine-year-olds.