Background: The present study was conducted to assess the association between maternal lifestyle factors and low birth weight in preterm and term births. Materials & Methods: 90 singleton pregnancies were divided into 3 groups. Group I were normal birth weight, group II were preterm LBW and group III were term LBW. Parameters such as education, marital status, SES, smoking, drinking, physical activity etc. were recorded. Results: Marital status was married in 22, 20 and 17 and unmarried/divorced in 8, 10 and 13 in group I, II and III respectively. Education was illiterate in 5, 9 and 12 and high& above in 25, 21 and 18 in group I, II and III respectively. SES was upper in 20, 16 and 4, middle in 8, 5 and 12 and lower in 2, 9 and 14 in group I, II and III respectively. The difference was significant (P< 0.05). Habitual alcoholism was present in 6, 14 and 10. Coffee or tea was 1-2 cups per day in 25, 11 and 16, and >2 cups per day in 5,19 and 14 subjects. The smoking habit was seen in 7, 13 and 11 subjects. Physical activity was nil in 4, 13 and 10 subjects in group I, II and III respectively. Conclusion: Authors found that expectant mothers ought to understand the harmful consequences of smoking and know how to shield themselves from passive smoke. There was an association between low physical activity, smoking alcoholism and low SES with low birth weight babies.