Background: This study was undertaken in a tertiary care teaching hospital in Kolkata to comparatively analyse the non-pharmacological supportive care interventions for reducing stress and pain in preterm and term newborns. Methodology: A prospective observational study conducted on 100 newborns of gestational age 34 weeks and above who weighed more than 1.5kg admitted in NICU at the Department of Paediatrics, of Dr B C Roy Post Graduate Institute of Paediatric Sciences, Kolkata, India from January 2018- December 2018. All the patients experienced moderately painful heel lance procedure and comparative analysis of four non-pharmacological supportive care interventions namely swaddling, facilitative tucking, kangaroo mother care (KMC) and non-nutritional sucking (NNS) for reducing stress and pain were studied using Premature Infant Pain Profile (PIPP)scales. Results: Present study had 52% female newborns. 69% were term babies with a mean weight of 2.59kg. Non-pharmacological supportive care interventions significantly (p-value < 0.001) reduce stress and pain in preterm and term newborns. Mean PIPP score was statistically significantly lower with each intervention; swaddling (4.27), facilitative tucking (3.43), KMC (1.84) and NNS (0.78) as compared with control (7.21). Non-nutritional sucking followed by Kangaroo mother care, facilitative tucking and swaddling were effective in reducing pain and stress in that order. Conclusion: Non-nutritive sucking, a non-pharmacological supportive care intervention is significantly effective and the best intervention in reducing stress and pain in preterm and term newborns