The aim of this study was to carry out a survey of the literature, mainly in Winnicott s work, about breastfeeding in its inter-subjective aspect. The psychological implications of the act of breastfeeding were considered, both for the baby and for the mother. Initially, mother-infant relations come about through mutuality, attuned communication, identification and dependence. For the woman in a state of primary maternal preoccupation, these processes give rise to the meeting with her archaic self, her infantile parts, emphasizing that how she was cared for, or not cared for as a baby, interferes in the way she relates to her own baby when she becomes a mother. But the mother-coming-into-being also has cultural influences, currently pointing to an overwhelming position: the mother is to breastfeed her child naturally, on demand, which, for many, is a daunting task. For this reason, it is necessary that the mother is cared for, especially in the beginning of a baby s life.