This study explores the risk factors for low birth weight (LBW) in an urban Indian setting by using a nested case-control design. Information on potential risk factors was sought from 384 pregnant women attending an antenatal clinic, and they were followed until birth. Based on birth weight, the babies of these women were categorized as cases or controls. Bivariate analyses between each risk factor and birth weight showed an unadjusted significant association (P < .05) for maternal age ≤20 years, antenatal clinic registration after the first trimester, ≤5 antenatal visits, and <80% of the recommended dietary allowance (RDA) for calories and proteins. Multiple logistic regression analysis showed an adjusted significant association for calorie intake <80% RDA (P < .048), low zinc intake (P < .001), and ≤5 antenatal visits (P < .001). This study emphasizes the continuing importance of timely and regular antenatal visits and intake of appropriate amount of calories. The role of zinc as a risk factor for LBW warrants further research.