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A computer-supported analysis of 722 breech presentations was performed, and the results were compared to those of 18,533 vertex presentations. This covered all labors performed in 10 Slovene obstetric hospitals in 1986. It was found that the greatest risk existed in the group of preterm breech deliveries. This group had the highest percentage of perinatal mortality (256%), unfavourable infant postpartum condition (1 min Apgar 1-3 24.8%; 5 min Apgar 1-3 11.4%), malformations (14.8%), intracranial bleeding (4.7%), respiratory distress (11.4%), and infections (2.7%). In term breech deliveries the number of malformations was also higher than in term vertex deliveries (3.9%: 1.1%). The cesarean section was used in 30% of breech presentations (8% in vertex presentation). The postpartum condition of preterm infants was slightly better when they had been delivered with a cesarean section (1 min Apgar 1-3 42.2%; 5 min Apgar 1-3 0%) than if delivered vaginally (1 min Apgar 1-3 25.0%; 5 min Apgar 1-3 14.6%), but this was not the case with infants born at term. Here the postpartum condition is better in vaginal deliveries. Surprisingly, the fetal monitoring was the least satisfactory in the group at the greatest risk.