The three emotional and psychiatric complications of post-partum are: puerperal psychoses; post-natal depressions; and post-partum blues. Puerperal psychoses (prevalence = 0.2%) are now well known in their clinical and therapeutic aspects. Much less known are the post-natal depressions, in spite of their high incidence (10 to 20% of women). The consequences upon the life of patients and mother-child bond are still ignored. These depressions are too rarely adequately treated. Finally, post-partum blues is to be recognized for a preventive purpose, its intensity being a predictive factor of post-natal depression.