Breastfeeding benefits is not just restricted to child, it protects the mother also. Nipple pain is the second most reason to cease breastfeeding. Aim of the study is to compare the post-test scores of lukewarm water compress among postnatal mothers whose babies are admitted in nursery in the experimental and control group. To compare the selected socio demographic variables, maternal and neonatal variables with nipple pain and breast engorgement among postnatal mothers whose babies are admitted in nursery. Posttest only control group design was used. Population comprises of all postnatal mothers whose babies admitted in nursery at WCH, JIPMER. A total of 226 samples who fulfilled the inclusion criteria were selected by simple random sampling. For mothers in the experimental group, lukewarm water compress was given before and after breast feeding at a temperature of 95F– 105F. Total duration is 20 minutes, thrice a day on 3rd and 4th postnatal day. By using six point breast engorgement assessment scale and numerical pain rating scale, breast engorgement and nipple pain was assessed on the 5th postnatal day (posttest) for both experimental and control group. There was a significant difference between the posttest scores of nipple pain(p=0.001**) and breast engorgement (p=0.001**) among the postnatal mothers in the experimental and control group. There was a significant difference between nipple pain, breast engorgement and MOD. The study concluded that the application of lukewarm water compress is effective in preventing the nipple pain and breast engorgement among postnatal mothers whose babies are admitted in nursery.