The thesis herein aims to analyze the implications involved in a relationship of care between babies and their caregivers in the early days of psychic life. Founded on an interchange between psychoanalysis and infantile development, this study discusses an intervention model which concentrates on the psychic constitution of babies, based on the relationships established with caregivers in care centers. The research on early object relations and constitution of the subject, carried out at the nursery of a given institution (children s shelter or daycare center), with babies between 6 and 18 months, sustains the analysis of the principles of baby care, the observation method and the clinical development of early intervention. The essential role of narrativity in relationships of care is central to our investigation and its theoretical basis lies in the works developed by D. Stern, B. Golse and G. Haag about the early stages of subjectivity, as well as in the metapsychological model proposed by Winnicott on the early relations between mother and baby. By accepting the role of baby care as an essential basis for the process of subjectivity in babies, this study looks to highlight the sensitive aspects of both the baby and the adult, confirming the notions of mutuality and co-construction as an essential part of practices relating to early childhood.