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Health actors in the perinatal period are now confronted with the need to integrate the multiple registers at stake in the development of the future child based on recent knowledge of brain plasticity. The brain has maximum receptivity to specific experiences during the “sensitive periods” of the first two years of life: after this period, it becomes difficult, if not impossible, for the brain structure to resume normal development. A lack of environmental adjustment is particularly harmful at these early stages of development. All kinds of difficulties with environmental adjustment can influence brain development. The objectives are to optimize the conditions for the newborn’s reception and to focus our attention on early development in the hope of reducing the child’s subsequent troubles. Growing and rigorous collaboration with all the teams concerned, and especially pediatricians over the past ten years, has made it possible to innovate in offering parents and babies new strategies for improving the sensory and emotional continuity of parents and the child from fetal life to the earliest stages of development. The experimental method of “positioning” the newborn was conceived in this climate of close collaboration: simple and reproducible, based on common sense, it allows the baby to feel a sense of continuity at the time of birth and express many interrelational skills. In situations of women with major psychic vulnerability, fathers have come together in large numbers to discuss this topic as early as the antenatal child psychiatric consultation. They made the effort to be present postpartum and in the multidisciplinary follow-up after the first three months, which suggests the effectiveness of this approach. Such a perspective opens up serious hopes for a potential research program to validate the avenues for reflection in light of the dazzling advances of the neurosciences. Continuing the identification effort by disseminating early prenatal interviewing and caring for full-term newborns with the same rigor as in developmental care for very premature infants are challenges that we can meet together with parents who have become coactors in the development of their child.