Objective: To estimate the incidence of low birth weight in new born babies in a tertiary care hospital.To determine the maternal factors which could affect the weight of new born baby. Research Design and Methods: Cross sectional study includes all institutional deliveries comprising mothers and their new born babies. Information regarding mother was obtained by personal interview and ANC record data during six months. Results: 796 mothers were studied, a significant association was found between low birth weight and age of mother at the time of admission, parity, literacy level of mothers, birth spacing, ANC check-up, consumption of iron / folic acid, occupation and type of work of mothers, mother having any medical illness like anemia, pregnancy induced hypertension and any previous or present bad obstetric complications. Conclusions: The finding of the present study clearly reveals that low birth weight can be tackled by providing adequate antenatal care to pregnant women in time. To bring more and more women to hospital for deliveries and provide them adequate ANC, this will prove a long way to reduce birth of low birth weight babies.