Our research is concerned with the observation of communication between the child and his parents (mother-baby vs. father-baby). The children are aged from 30 to 36 months old. Communication was analysed according to utterances functions and social aims. 14 French children, 7 boys and 7 girls were filmed with each of their two parents in their home environment. 5 minutes of verbal interactions were entirely rewritten and analysed according to categories adapted from the speech acts theory. The results indicate that mothers generate more expressive utterances and fathers more commissive ones. Mothers also tend to ask more information requests. The children generate more assertive utterances with the mothers and are more directive with the fathers. Concerning parental feedback functions (approval, reformulation, clarification requests), there is no significant difference between mothers and fathers. These results are being discussed from a pragmatic and differential point of view. (Contains 6 tables, 7 figures, and 4 notes.)