Introduction: This hospital based descriptive observational study was conducted to find out the proportion of low birth weight babies in institutional deliveries and to identify socio demographic & obstetric profile of mothers of Low birth weight babies. Methodology: This study was conducted since 1 September 2014 to 31 August 2015 in Department of Obstetrics & Gynaecology, Mahila Chikitsalaya Sanganeri Gate & under Supervision of PHOD, Department of Community Medicine, Sawai Man Singh Medical College and attached Hospitals, Jaipur. Results: Among 900 live birth observed during study period, 175 babies were LBW. So the proportion of LBW was 19.44%. Average Birth weight of LBW was 1910.10 ± 420.0 (gm). Majority (62.29%) of babies belonged to mothers of age 21-25 years and maternal height >145 cm (88%) and Hindu religion (80.57%). Most (64.57%) of the mothers of LBW babies were from either General or OBC caste. Majority LBW babies were born to mothers who were residing in rural area (61.14%) and living in joint family (88.57%). 44.57% LBW babies were born to families where family heads were illiterate. 42.86% mothers of LBW babies were educated up to Primary-secondary level and maximum 38.29% mothers belonged to SES –III. Maximum 57.14% LBW babies belonged to mothers with parity 1. 18.86% had bad obstetric history, 3.43% had habit of tobacco chewing and 29.71 had passive smoking. In 42.85% mothers, time since last pregnancy was 2-3 years. 65.71% had gestational age <37 weeks. 65.14% mothers took >2 rest and sleep. Diet intake was same as before in 82.29%. Conclusion: Availability and utilization of comprehensive Obstetric care should be ensured through more community participation and involvement of NGOs.