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Recent studies on early development have shown that the human newborn’s abilities for social communication are functional from birth onward, and the importance of these early abilities. Active participation in the social dialogue is one of these numerous abilities, which are ready to be activated in the infant through interactions with the caregivers. However, an optimal start in this area, and the subsequent intersubjective development, may be hampered by factors linked to the parents, postnatal depression in particular, or linked to the child, such as prematurity or intrauterine growth restriction.The goal of this pilot study is to confirm the age of onset of social smiling and to evaluate the level of Shared Pleasure (SP) in a five-minute face-to-face situation of free play with each of the parents, at two and three months of age. It will assess correlations between SP rate, level of ISSWB, gestational age, and birth weight, as well as with ICQ temperament scores as assessed with the French version of the ICQ, and the IMBS scores assessed pre – and post-natally with the French validations of the scale. À second goal of the study is to prepare for a larger study on the development of intersubjectivity and its disorders, starting from the hypotheses of the PREAUT early autism screening research. It seeks AI algorithms for rating Shared Pleasure and relational withdrawal, with a view to developing applications that will enable professionals to routinely rate important elements of intersubjective development : the first social smile, Shared Pleasure, the baby’s relational withdrawal behavior, affective tuning capacity, and the predictivity of these elements on later outcomes in terms of neurodevelopmental disorders. The goal of a larger study will be to assess the effects of early Shared Pleasure parental guidance on the child’s psychomotor, intersubjective, and cognitive development.