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The postpartum period is closely associated with the chaos connected to the psychic, physical, generational, and groupal changes imposed on the mother by the immaturity of the newborn child, all of them redoubled by a fundamental, temporary interactive asymmetry. The absence of reciprocity between mother and newborn risks provoking painful narcissistic and identity distress.Postnatal depression can be seen as an important moment that signifies that psychic transformations have been completed, marking the end of the process of pregnancy. It bears witness to an adaptive signal for the self, demonstrating the intersubjective work of emotion, which matches the necessary maternal regression when faced with the baby and the actualization of new affective issues. It thereby encourages, in some sense, the passage from the maternal intrapsychic to the development and birth of the psychic life of the baby, and the interactive adjustment of the dyad.