This longitudinal study examined how male partners affect the breastfeeding decisions and behavior of first-time mothers. Based on the reasons model by Meichenbaum and Fong (1993), the breastfeeding reasons, intentions, and behavior of 317 first-time mothers were assessed prenatally and at six time points in the first year postpartum. In a prenatal assessment, men indicated their prescriptive beliefs about whether their partner should breastfeed at the same six time points. Men’s prescriptive breastfeeding beliefs predicted the strength of their partners’ breastfeeding intentions, over and above the women’s own breastfeeding reasons, and they predicted breastfeeding behavior over and above the women’s intentions. These results demonstrate the influence wielded by intimate partners and highlight the importance of focusing on partners’ beliefs when predicting and intervening in health behavior decisions.
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