Aim and objectives: to assess the social and demographic factors affecting weight gain of pregnant women and determine the correlation between maternal weight and maternal outcome.

Methodology: Prospective observational study carried out in two different groups and settings of populations, one enrolled in antenatal clinic of tertiary care hospital (sample size 197) and other is antenatal clinic of urban health centre located in suburban slum community (sample size 97) of a same metro city.

Result: Significant association was found between maternal weight gain and maternal outcomes in the form of mode of delivery, maternal complications, duration of hospital stay, Ability to breastfed within an hour of delivery in both groups.