This thesis estimates the predictive factors of success of vaginal birth after cesarean delivery and the impact of a BMI, both pre-pregnancy and at delivery on the success rate of VBAC attempt.A logbook on labor and delivery at the Department of Obstetrics and Gynecology at the University of Debrecen used to identify those patients who attempted VBAC in 2016. It yielded 114 cases, and further data gathered from those patients, including information about weight-related factors throughout the pregnancy. Other variables of interest included GDM, previous successful VBAC or NSVD, inter-delivery interval, birthweight. A history of previous successful VBAC significantly increases the likelihood of success of subsequent VBAC. However, from this study, the conclusion that BMI is a predictive factor concerning VBAC success cannot be made.