This study presents an analysis of relations between health professionals and pregnant adolescents in the installations of the prenatal care program of a public hospital in Rio de Janeiro. It involves qualitative research based on an interpretive approach, with comprehensiveness and humanization of care in relationship dimensions as a theoretical benchmark. Based on two predefined themes - the interaction between subjects and educational dimension of health practices - 22 individual and group care sessions were observed, with the participation of 31 pregnant adolescents, 5 professionals and 2 nutrition interns. The interpretation of the data using content analysis created five categories. The results show the negative effect of the predominance of the biomedical dimension in the perception of health professionals about psychosocial and cultural aspects of teenage pregnancy. There was a failure to utilize the care session as a privileged space for the construction of collective and individual significance about pregnancy and teenage motherhood, albeit in the context studied there are professionals who are aware of the need for a broader view regarding the needs of pregnant adolescent.