A cross sectional study was conducted in a public maternity hospital, Dhaka, Bangladesh on 316 pregnant women and their newborns. The study aimed at examining the relationship between birth weight and maternal sociodemographic, anthropometric and haematological factors. The study revealed that about 15% of babies were of low birth weight (LWB). The mean birth weight was found to be 2889i:468g. The LBW was more common in younger «20 years) and older (~O years) mothers, low income group, day labourer a~d those with little or no education. The mean birth weight of male babies was on an average 138g more than that of female babies (p<0.032). The babies of the mothers who had at least three antenatal visits.