Evaluation of self-observation signs noted during post-partum, enables to study the physiology of this period. The signs analyzed in this study are: discharge of vaginal secretions, temperature discrepancy and bleeding. The originality of the study lies in the comparison of successive post-partum periods: 2 to 6 post-partum periods were studied in 163 women; in addition, we studied 38 cases including breast feeding time details and children reactions. The authors described especially the retention effect of the pregnancy and the inhibiting effect of breast feeding on the return of the fertility, by progressively escaping these two effects, and the part of the woman's reaction.