Effect of the Marmet Technique on Breastfeeding Problems and Breastfeeding Self-Efficacy in Postpartum Women

Inclusion Criteria: * Women aged 18 to 49 years * Able to read and write in Turkish * Voluntary agreement to participate in the study * Delivered a healthy full-term infant * Had a spontaneous vaginal birth * Actively breastfeeding during the postpartum period Exclusion Criteria: * Presence of a clinically serious breastfeeding problem in the mother or infant during the early postpartum period * Transfer of the mother or infant to another center before completion of the first data collection stage * Inability to complete follow-up assessment on postpartum day 15 or refusal to participate in the follow-up interview * For participants assigned to the intervention group, inability to complete the Marmet technique training at postpartum 6 hours or failure to respond to the follow-up call on postpartum day 7 * Meaningful missing or incomplete data in study forms or scales * Withdrawal from the study at any point during the 15-day follow-up period * Development of any unexpected maternal or neonatal health condition requiring discontinuation of breastfeeding, such as intensive care need, serious maternal infection, or infant pathology preventing sucking