[Acute anemia caused by hemoperitoneum disclosing hemorrhagic disease of the newborn].

A neonate who was not given prophylactic vitamin K injection was admitted with acute anemia and hemoperitoneum. The evolution was favorable with medical treatment only. Vitamin K deficiency appears to be the main cause of this hemorrhagic disease. There is a controversy on this subject, as hepatic deficiency seems to be involved in certain cases.