Breast-feeding self-efficacy is defined as a mother's confidence in her ability to breastfeed her child. It is one of the variables affecting breastfeeding duration and consequently developmental indicators in child, which have been rarely studied. This study aimed to Impacts of antenatal educational interventions base on BASNEF Model on mothers' breastfeeding self-efficacy: a Quasi-experimental study. This was a quasi-experimental study done on 100 nulliparous mothers referred to the selected

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... linics in Shiraz. Sampling was done by random method. The intervention was held based on BASNEF components in four educational sessions besides a session on cognitive norms, while the control group received the routine education. The mean score of breast-feeding self-efficacy was measured both before and after the intervention by Fax and Dennis questionnaire besides its correlation with child physical developmental indicators. SPSS18 was applied to analyze the data through paired t-test, independent t-test, and Chi-square test. The mean age of participants was 23.86 ± 4.30 and 24.4 ± 4.18 in BASNEF and control groups, respectively. After the intervention, there was a significant difference in the mean score of self-efficacy in the intervention group compared to the control group (p <0/001). In addition, there was a significant positive correlation between breast-feeding self-efficacy and infants' weight at the age of 3 months besides height at the age of 1 and 3 months (p<0.05). BASNEF based breastfeeding training was related to the rise in breastfeeding self-efficacy in nulliparous pregnant women and subsequently improvement of children's physical growth indicators.