This research was designed to increase our understanding of how the motivational antecedents to childbearing and emotional responses to pregnancy affect the subsequent attachment bond of a toddler to his or her mother. Using a sample of 1,364 mothers and their newborns from the Study of Early Child Care, we tested a mother-child influence framework hypothesized to mediate between the mother's preconception motivation and pregnancy wantedness and her child's security of attachment at 24 months. Almost all elements of the mediational sequence were confirmed in a structural equation model. We observed 2 unmediated pathways to attachment security, 1 from preconception motivation and 1 from parenting stress during infancy, and suggest interpretations of these unexpected pathways.