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INTRODUCTION: Pre pregnancy Body mass index (BMI) is weight of women before she conceives. Gestational weight gain (GWG) is understood as the weight gained before the women conceives and prior to delivery. OBJECTIVES: To classify the patients according to pre-pregnancy BMI in groups To categorize the patient according to gestational weight gain in each BMI groups To assess the pregnancy outcome in relation to different BMI groups To assess the pregnancy outcome according to weight gain during antenatal period. To evaluate the pregnancy outcome in correlation with gestational weight gain in patients with different BMI groups. MATERIALS AND METHODS This prospective observational study was conducted at Department of OBGY, Teerthanker Mahaveer Medical college & Research centre. The weight of the mother was assessed at the first visit in her antenatal checkup, every visit and at delivery. The patient?s pre pregnancy BMI was calculated and according to GWG in varying BMIs groups RESULTS: Majority 78% of women had 37-40 weeks of gestational period Most 54.1% of patients were multigravida On the basis of BMI, most 40.0% of patients had normal BMI (avg 22.08) Majority 41.3% of women were gaining 10.1 to 15 kg of weight during the pregnancy Upon correlation of BMI and pregnancy outcome it was observed that LSCS, preeclampsia, macrosomia, LBW showed statistically significant association with categories of BMI. Upon adequate weight gain no significant association seen between outcomes Excessive weight gain had correlation with preeclampsia, macrosomia (85%), less than adequate weight gain was associated with LBW (41.2%) Obese women had higher risk of section (42.6%), preeclampsia(63.6%) Underweight women were associated with IUGR CONCLUSION: Pre pregnancy counselling is required for adequate weight gain during pregnancy and maintenance of normal BMI before conception as during antenatal period it can affect the pregnancy outcomes. Therefore both prepregnancy BMI and GWG are important factors for the overall health of the mother and the baby.