The Relationship Between Oxytocin Massage in Mothers With Insufficient Milk Production in the Early Postpartum Period and Breastfeeding Self-Efficacy and Milk Let-down Reflex: A Randomized Controlled Study

Inclusion Criteria: * Being 18 years of age or older * Being in the early postpartum period (within the first 24-48 hours after birth) * Having had a single, live birth via vaginal delivery or cesarean section * Having a term (≥37 weeks) and healthy baby * Being in the same room as the baby (rooming-in practice) * Having started breastfeeding * Reporting insufficient milk production or expressing difficulty with the milk let-down reflex * Not having a cognitive, neurological, or serious psychiatric problem that would impede communication * Voluntary participation in the study and providing written informed consent Exclusion Criteria: * Having given birth preterm (\<37 weeks) * Having given birth as a result of a multiple pregnancy * Having been admitted to the neonatal intensive care unit (NICU) * The baby having a congenital anomaly that prevents breastfeeding (e.g., cleft lip and palate) * The mother having medical conditions that contraindicate breastfeeding (HIV infection, active tuberculosis, etc.) * The mother developing serious postpartum complications (postpartum hemorrhage, eclampsia, serious infection, etc.) * The presence of anatomical or pathological conditions related to the breast that may prevent breastfeeding (advanced mastitis, breast abscess, etc.) * The presence of skin lesions, surgical incisions, or infections in the back that would prevent the application of oxytocin massage * Failure to complete the intervention or wishing to withdraw from the study will be excluded.