<![CDATA[Background: Exclusive breastfeeding remains a major public health challenge despite its well-documented benefits for infant growth, development, and disease prevention. Low breastfeeding self-efficacy is recognized as one of the key determinants contributing to unsuccessful exclusive breastfeeding, highlighting the need for comprehensive breastfeeding support interventions. Purpose: This study aimed to examine the effect of a comprehensive breastfeeding support package on breastfeeding self-efficacy among postpartum mothers at Boyolali I Community Health Center, Central Java, Indonesia. Methods: A quasi-experimental study with a non-equivalent pretest–posttest control group design was conducted among 34 postpartum mothers, who were allocated into intervention (n = 17) and control (n = 17) groups using consecutive sampling. The intervention group received a comprehensive breastfeeding support package consisting of breastfeeding education, practical breastfeeding assistance, emotional support, and motivational reinforcement, whereas the control group received routine postpartum care. Breastfeeding self-efficacy was assessed using the Breastfeeding Self-Efficacy Scale–Short Form (BSES-SF), while breastfeeding effectiveness was evaluated using the LATCH Assessment Tool. Data were analyzed using paired t-tests, independent t-tests, and Spearman's rank correlation with a significance level of p < 0.05. Results: Baseline characteristics were comparable between groups (p > 0.05). Following the intervention, the breastfeeding self-efficacy score increased significantly in the intervention group from 43.71 ± 6.15 to 60.24 ± 4.82 (p < 0.001), whereas the control group showed no significant improvement (44.18 ± 5.92 vs. 47.53 ± 5.41; p = 0.084). The mean improvement in breastfeeding self-efficacy was significantly greater in the intervention group than in the control group (16.53 ± 5.12 vs. 3.35 ± 4.26; p < 0.001). Furthermore, breastfeeding self-efficacy was positively correlated with breastfeeding effectiveness (r = 0.612, p < 0.001). Conclusion: A comprehensive breastfeeding support package effectively improved breastfeeding self-efficacy among postpartum mothers and was associated with better breastfeeding effectiveness. Integrating structured breastfeeding support into routine postpartum care may enhance maternal confidence and contribute to improving exclusive breastfeeding outcomes in primary healthcare settings.]]>
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