This thesis estimates 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 .Of the 114 patients with a history of previous cesarean section, 68 patients had a subsequent successful VBAC (59,6%). Patients with BMI 25-30 and BMI >30 had a lower chance of VBAC success than patients with BMI<25, although not statistically significant (P=0,8338 and P=0,6094, respectively). 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.