AIM: – This study was conducted to evaluate the effects of gestational diabetes mellitus on the fetus with special emphasis on perinatal complications.   METHOD AND METHODOLOGY:– 50 antenatal women diagnosed as gestational Diabetes mellitus recruited in this study and were followed up to record their labour and delivery events with note of all fetal and neonatal outcomes.   RESULTS:– From our study we observed various neonatal complications in these patients of gestational diabetes mellitus namely fetal macrosomia–(14%) , neonatal hyperglycemia– (24%), respiratory distress syndrome–(12%),  neonatal polycythemia–(4.0%),  hyperbilirubinemia –(36%) ,hypocalcemia– (14%),  small for gestational age fetuses– (6%) ,IUFD/Stillbirths – (4%), neonatal deaths–(6%).   CONCLUSION: – Universal screening and regular antenatal checkups to diagnose gestational diabetes mellitus early will lead to timely and proper management of the condition there were decreasing the neonatal morbidity and mortality significantly.