The relationship between quality of infant-mother attachment and infant competence in initial encounters with peers.

18-month-old infants and their mothers were observed in the Ainsworth strange situation (SS) in order that security of attachment might be assessed. Infant dyads were created for observation in unstructured peer interaction according to their SS classification (security of attachment). Focus was on the subgroups within the securely attached (B) category. Results indicated a relationship between quality of infant-mother attachment and infant peer competence. The B1 and B2 infants engaged in more frequent and more sophisticated interaction with peers than did the B3 and B4 infants, who intensely sought proximity and contact with their mothers in the peer session just as in the SS. The B1 and B2 infants engaged in more distal interaction with their mothers and were more sociable with the peers' mothers and with the stranger in the SS. Implications of individual differences in quality of attachment for the development of social competence and social relationships are discussed.