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OBJECTIVE: Obesity in pregnancy carries significant maternal and fetal risk. The aim of this study was to investigate the effect of maternal body mass index on pregnancy outcomes. PATIENTS AND METHODS: The study retrospectively reviewed the clinical outcome of 485 pregnant women who delivered at the Department of Obstetrics and Gynecology, Clinical Centre of Vojvodina, Novi Sad, during the period of three years (2018-2020) and compared them against the body mass index (BMI). Correlation coefficient was calculated for BMI and seven pregnancy complications (hypertensive syndrome, preeclampsia, gestational diabetes mellitus, intrauterine growth restriction, premature rupture of membranes, mode of delivery and postpartum hemorrhage). The collected data were presented in the form of median values and relative numbers (the measure of variability). The implementation of the simulation model and its verification were carried out using a specialized programming language, Python. Statistical models were created where the Chi-square and p-value were as determined for every observed outcome. RESULTS: The average age of the subjects was 35.79 years and average was BMI 29.28 kg/m². A statistically significant correlation was found between the BMI and arterial hypertension, gestational diabetes mellitus, preeclampsia and cesarean section. The correlations between the body mass index and postpartum hemorrhage, intrauterine growth restriction and premature rupture of membranes were not statistically significant. CONCLUSIONS: As high BMI correlates with a number of negative outcomes in pregnancy, weight control before and during pregnancy and proper antenatal and intranatal care are necessary to achieve a favorable pregnancy outcome. © 2023 Verduci Editore s.r.l. All rights reserved.