This study examined associations between supportive coparenting and infant-mother and infant-father attachment security. Observed and parent-reported coparenting, and observed maternal and paternal sensitivity were assessed in a sample of 68 families with 3.5-month-old infants. Infant-mother and infant-father attachment security were assessed in the Strange Situation Procedure (Ainsworth, Blehar, Waters, & Wall, 1978) at 12 and 13 months of age, respectively. Observed and reported supportive coparenting were associated with greater attachment security in the infant-father, but not the infant-mother, attachment relationship. The link between observed coparenting and infant-father attachment remained after accounting for paternal sensitivity. Furthermore, child gender moderated some associations between coparenting and infant-parent attachment security. Among families with boys, observed and reported supportive coparenting was related to greater infant-mother and infant-father attachment security, respectively. Coparenting was unrelated to infant-mother or infant-father attachment security among families with girls. Results highlight a possible link between the coparental and father-child relationships and the need to consider both parent and child gender when examining associations between family functioning and attachment.
Keywords: attachment security; coparenting; father-child relations; gender; mother-child relations; sensitivity.