Background <p>This study aimed to determine the effect of simulator-assisted individualized breastfeeding support given to mothers on their breastfeeding exclusively for the first six months, breastfeeding problems, and breastfeeding competencies.</p> Methods <p>This was a randomized controlled study. The population of the study consisted of pregnant women who applied to hospital in the west of Türkiye (<i>N</i> = 1800). 102 pregnant women were included in study (intervention = 51, control = 51; <i>n</i> = 102). Pregnant women in the intervention group received simulator-assisted breastfeeding education and a booklet explaining the breastfeeding process during the antenatal period, while the control group received only a booklet. Exclusive breastfeeding of infants in the first six months postpartum, occurrence of breast problems, and breastfeeding competencies of mothers were monitored by home visits on the fifth day, the fifteenth day, and the first month of the postpartum period and by telephone in the third and sixth months.</p> Results <p>The rate of exclusive breastfeeding was significantly higher in the intervention group compared to the control group in all follow-ups. Breast problems were observed less frequently in the mothers of the intervention group in all follow-ups. Breastfeeding self-efficacy scale scores were also found to be significantly higher in the intervention group mothers compared to the control group.</p> Conclusions <p>As a result of the research, it was determined that mothers who received individual breastfeeding counseling fed their babies exclusively with breast milk for a longer period of time, had fewer breast problems, and had higher breastfeeding adequacy.</p> Trial registration <p>Study findings were recorded in the Clinical Trial System (Registration No: NCT06341140, Registration Date: 02.04.2024).</p>