This article presents the construction of a chain of care of perinatal psychiatric situations within the University Service of Child and Adolescent Psychiatry, which evolved within the framework of the departmentalization of this service. This chain of care includes the psychiatry of the liaison, the outpatient clinics as well as and day hospital care and extends from the prenatal period to the child's five years, with a focus on the relationship between child and caregivers, as well as an individual perspective on the child. Herein, we present and describe the different units and their functioning emphasizing the synergies and collaborations put in place that ensure the best possible continuity for patients and their families by promoting as much as possible the therapeutic alliance in this chain of care.