A total of 123 women with congenital anomalies of the uterus were analysed. It has been found that earlier pregnancies terminated with abortus in a high percentage (68.09%). In the course of the last pregnancy and the first in primiparas, 39.02% of women developed one or more complications. The delivery itself was completed by cesarean section in 75.6% of parturients. In the course of labour, complications appeared in 44.71% of women; most frequently there was a premature rupture of the bag of waters and the adhered placenta. The abnormal position of the fetus was found in 54.47%, it was mostly the pelvic presentation. A comparison between the perinatal mortality in earlier deliveries and the last one has shown that there is a significant association between the use of cesarean section and perinatal mortality. In earlier deliveries the perinatal mortality rate was 48.78% and in the last pregnancy 8%. There were 19.2% before-term babies. By Apgar score 1--8, 55.73% of newborns were assessed. The babies were often hypotrophic in relation to their gestation age. A high percentage of congenital anomalies in newborns (16.8%), mostly joint deformations, was established. It is concluded that uterine congenital anomalies exert an unfavourable effect on pregnancy. They put both mother and child at risk. The risk could be diminished by a timely detection of uterine anomalies, by the appropriate therapy, and by the use of cesarean section.