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The author shows the construction of inter-subjectivity between the baby and its groups, according to its age. He uses a psychoanalytical approach to the observation of the infant in its family and its extension to the day nursery. The results are coherent with respect to developmental psychology and psychopathology, and show that the baby is growing into inter-subjectivity from the start. The various forms of inter-subjectivity appear successively in accordance with the predominance of sensations, feelings, representations of action or, finally, of verbal language.