This randomized controlled study aimed to evaluate the effect of breastfeeding counselling delivered through a smartphone application on breastfeeding self-efficacy, breastfeeding duration, and breastfeeding-related problems among primiparous women in the postpartum period. A total of 60 women were allocated to either an intervention group receiving app-based counselling and motivational messages or a control group receiving routine postpartum care. Outcomes were assessed at multiple follow-up points up to six months postpartum using validated scales. The study investigated whether continuous mHealth-based support improves breastfeeding outcomes compared with standard care.