This randomized controlled trial aims to evaluate the effects of oxytocin massage on breastfeeding self-efficacy and the milk ejection reflex among mothers experiencing insufficient milk supply in the early postpartum period. Insufficient milk supply is a common issue often linked to maternal stress, which can inhibit oxytocin release and negatively impact the milk ejection reflex and the mother's confidence in breastfeeding. By applying oxytocin massage to the thoracic paravertebral region, this study seeks to stimulate oxytocin release non-pharmacologically. The primary objective is to determine whether this intervention improves physiological milk flow and enhances maternal breastfeeding self-efficacy compared to routine postpartum care.