Assessment of First Trimester Body Mass Index and Gestational Weight Gain and Its Effects on Fetomaternal Outcome: A Prospective Observational Study from a Tertiary Care Teaching Hospital in South India.
Background: Maternal nutritional status during early pregnancy plays a pivotal role in determining both maternal and neonatal outcomes. First trimester body mass index (BMI) reflects the pre-pregnancy nutritional status of the mother and has emerged as an important predictor of pregnancy-related complications. Similarly, gestational weight gain (GWG) is a modifiable factor that significantly influences fetal growth, birth weight, and maternal health. Both inadequate and excessive weight gain during pregnancy are associated with adverse fetomaternal outcomes, including preterm delivery, fetal growth restriction, low birth weight, gestational diabetes mellitus, gestational hypertension, cesarean delivery, postpartum haemorrhage, and neonatal intensive care unit admission. Although international recommendations for gestational weight gain are available through the Institute of Medicine (IOM), evidence from the Indian population remains limited. Therefore, evaluating the relationship between first trimester BMI, gestational weight gain, and pregnancy outcomes is essential for developing appropriate antenatal nutritional interventions and improving maternal and neonatal health. This study evaluated the influence of first trimester BMI and gestational weight gain on fetomaternal outcomes among pregnant women receiving antenatal care. The study topic, objectives, and general methodology are derived from the uploaded manuscript. Aim: To assess the association of first trimester body mass index and gestational weight gain with maternal and neonatal outcomes among pregnant women attending a tertiary care teaching hospital. Materials and Methods: A prospective observational study was conducted in the Department of Obstetrics and Gynaecology, Kanyakumari Government Medical College, Asaripallam, Nagercoil, Kanyakumari District, Tamil Nadu, over a one-year period from January 2013 to December 2013. One hundred pregnant women attending the antenatal outpatient department during the first trimester were enrolled and followed until delivery. Women aged 18–45 years with uncomplicated singleton pregnancies who provided written informed consent were included in the study. Maternal BMI was calculated during the first trimester, and gestational weight gain was assessed according to the Institute of Medicine recommendations. Maternal complications, obstetric outcomes, mode of delivery, gestational age at delivery, neonatal birth weight, fetal growth restriction, neonatal intensive care unit admission, and other neonatal outcomes were recorded. Data were analysed using the Statistical Package for the Social Sciences (SPSS). Descriptive statistics were expressed as frequencies and percentages, and associations were analysed using the Chi-square test or Fisher's exact test. A p-value <0.05 was considered statistically significant. This methodology is based on the original study design, with the requested change in study location and period. Results: Among the 100 pregnant women included in the study, 42% had normal BMI, 32% were underweight, 16% were overweight, and 10% were obese. Appropriate gestational weight gain was observed in 50% of women, whereas 34% had inadequate weight gain and 16% had excessive gestational weight gain. Underweight women experienced higher frequencies of anaemia, oligohydramnios, fetal growth restriction, and preterm delivery, whereas overweight and obese women had significantly higher rates of gestational hypertension, gestational diabetes mellitus, polyhydramnios, postpartum haemorrhage, thromboembolic complications, instrumental delivery, and cesarean section. Inadequate gestational weight gain was associated with fetal growth restriction, low birth weight, and increased neonatal intensive care admissions, while excessive gestational weight gain was associated with macrosomia and maternal metabolic complications. These findings are consistent with the results reported in the uploaded manuscript. Conclusion: First trimester body mass index and gestational weight gain were significantly associated with both maternal and neonatal outcomes. Underweight women were more likely to develop anaemia, oligohydramnios, fetal growth restriction, and low birth weight infants, whereas overweight and obese women demonstrated higher risks of gestational diabetes mellitus, gestational hypertension, postpartum haemorrhage, polyhydramnios, operative delivery, and macrosomia. Appropriate nutritional counselling before conception and throughout pregnancy, together with regular monitoring of gestational weight gain, may contribute substantially to improved fetomaternal outcomes.