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Antenatal diagnosis, through the context of anticipation it creates, both on the part of the baby and of their environment, is an experiential situation characterized by an emotional chain reaction. It is an opportunity to analyze how memory zones are reactivated to cope with the anticipation of the future stages of pregnancy, birth, and the first years of the child's life. Interdisciplinarity within the field of obstetrics enabled child psychiatrists to be alert to the emergence of harmful emotional disorders in the establishment of parent–child relationships: interactive disharmony, postpartum depression, and subsequent developmental disorders. The teams discovered their own capacities to refine the identification of emotional shifts and the decoding of states of parental distress. The anniversary dates that mark psychic life had long alerted psychotherapists who interpreted the impact after the fact. The turning point offered by the active approach to anticipating antenatal diagnosis is to allow the context in which emotional reactivation occurs to happen naturally, thereby making use of the risk of traumatic repetition. By taking a detailed history, anticipating the dates at risk becomes a major public health issue for every professional involved in obstetric monitoring, provided that he/she does not remain alone in the face of a complex family situation. The possibilities for the child psychiatrist/psychologist to intervene in first and/or second line allow the whole team to enrich their prevention capacities.