The analysis of pregnant women's cards and the birth history of 50 women who gave birth to newborns with hemolytic disease was carried out. It is revealed that the most significant risk factors for the development of hemolytic disease of the newborn are: abortion, threatened miscarriage, anemia of pregnant women. A high correlative relationship was noted between the occurrence of GB due to Rhesus conflict with maternal parity, abortions, anemia of pregnant women, in newborns born to ABO of a conflict pregnancy with the first pregnancy of the mother.