The present research examined parental beliefs about the importance of the paternal caregiving role, mothers' and fathers' reports of infant temperament, and observed marital quality as predictors of infant-mother and infant-father attachment security, over and above the effects of parental sensitivity. Infants' attachment security to mothers and fathers were observed in the Strange Situation at 12 and 13 months, respectively (N = 62 two-parent families). Hierarchical regression models revealed that mothers who viewed the paternal caregiving role as important were less likely to have securely attached infants, but only when infant fussiness was high. In addition, fathers who viewed the paternal caregiving role as important were more likely to have securely attached infants, but only when infants' fussiness or marital quality was high.