The passing into the adult age of the young woman is often the case on the occasion of her first pregnancy. Psychoanalytic research on that very field, with close collaboration with the medical team, allows one to observe more closely the moves of the feminine psychological life emerging during the course of the pregnancy and the birth delivery. Pregnancy seems to be the very moment of a silent passion for the primary internal object, since the psychological transparency allows a re-voicing of both sexual and incestuous representations that had been decathexed. During the birth delivery, due to the somatic disturbance, the latter representations are liable to filter and give way to an unbindable libidinal excitement with the possible risk of the erection of a traumatic neurosis.