Abstract : The primary objective of this research was to evaluate the effectiveness of hypnobreastfeeding in enhancing breast milk production, infant growth, and maternal hormonal changes. This research was a quasi-experimental study conducted at the Regional Hospital Koesma in Tuban, Indonesia. The study spanned 12 months and involved 80 postpartum women, divided into two groups: a treatment group receiving hypnobreastfeeding sessions and a control group receiving standard postpartum care. Key metrics for the study included demographic data, levels of dopamine, Thyrotropin-Releasing Hormone (TRH), and Prolactin (PRL), breast milk volume, and infant growth, as measured by the Denver Developmental Screening Test II (DDST II). The study observed significant hormonal changes post-intervention in the treatment group. There was a marked decrease in dopamine levels (58±16.34) and an increase in TRH (24.55±47.91) and PRL (482.92 ng/ml±596.6). Additionally, the treatment group exhibited a notable increase in breast milk production and enhanced infant growth compared to the control group. Specifically, breast milk volume and infant weight in the treatment group were significantly higher, especially evident in the 1-6 month period post-intervention. The findings of this study suggest that hypnobreastfeeding is a beneficial intervention for breastfeeding mothers, significantly impacting breast milk production and infant growth. The hormonal changes observed in the treatment group further support the efficacy of hypnobreastfeeding. These results highlight the potential of hypnobreastfeeding as an effective practice for breastfeeding mothers, paving the way for further research into its comprehensive impacts on maternal and infant health.