Background: Necrotizing enterocolitis is defined as an inflammatory bowel necrosis in premature infants and is major cause of morbidity and mortality in neonatal intensive care units throughout the world. We aim to study the role of probiotics in reducing incidence and severity of necrotizing enterocolitis in preterm neonates ≤34 weeks and its role on secondary outcomes like mortality, time to reach full feeds, daily weight gain, days of hospitalization and effect on nosocomial infections.Methods: This study was a prospective randomized controlled interventional trial conducted in SGRDIMSAR, Amritsar. A sample size of 150 was selected. 75 were randomized to test group and 75 to control group by simple random sampling.Results: The incidence of NEC was significantly lower in the test group compared with the control group (1 of 75 neonates vs 12 of 75 neonates; p=0.001). The severity of NEC, nosocomial sepsis and mean duration of hospital stay was significantly lower in the test group. Daily weight gain was significantly higher in the test group. There was no significant difference in mean age of onset of NEC, mortality and mean age to reach full feeds in two groups.Conclusions: Incidence and severity of NEC was less in the probiotic group. Daily weight gain was better, nosocomial sepsis and mean duration of hospital stay were less in the probiotic group.