rates of uterine rupture during vaginal birth following one previous c-section, done by the typical technique, are estimated at 0.9%. rates are greater among those who have had multiple prior c-sections or an atypical types of c-section. in those who do have uterine scarring, the risk during a vaginal birth is about 1 per 12,000. risk of death of the baby is about 6%. those in the developing world appear to be affected more often and have worse outcomes.