This clinical study is designed to evaluate whether Transcutaneous Electrical Nerve Stimulation (TENS) is an effective, non-drug method to relieve postpartum uterine pain during breastfeeding in multiparous women (women who have given birth multiple times). Breastfeeding in the first 48 hours after delivery often triggers strong, painful uterine contractions due to the natural release of oxytocin. While standard care typically relies on pain-relief medications, this study investigates if TENS, a safe, low-cost device that sends gentle electrical impulses through small skin patches, can significantly reduce this pain and decrease the need for systemic medications. Participants will be randomly assigned to either receive standard postpartum pain medications or use a TENS device during two consecutive breastfeeding sessions. Researchers will measure and compare the peak pain levels between both groups using a standard 0 to 10 pain scale. The aim is examining whether TENS will significantly reduce postpartum uterine pain during breastfeeding and decrease medication use compared with standard care.