This paper discusses Merleau-Ponty's use of idea of ambivalence and its role in psychological conflicts. Merleau-Ponty affirms ambivalent conflicts as lived and social rather than biologically determined, as one might have in some developmental accounts, or hidden, as in some psychoanalytic accounts. With this concept, the paper takes up feminist considerations of the conflicts experienced by mothers in breastfeeding. It argues that the Merleau-Pontian and feminist approach to considering breastfeeding provides a nuanced model for thinking about development that is better suited to cases where both the child and the parent are co-evolving.