Although the health benefits to both mother and child produced by breastfeeding have been documented, and numerous efforts have been made to promote breastfeeding rates in the United States, extended breastfeeding (breastfeeding beyond 12 months) research has been largely overlooked. Guided by the Framework of Integrative Normative Influences on Stigma, this study examined how extended breastfeeding was perceived among medical and nursing students and how perceptions of extended breastfeeding were translated into stigmatizing outcomes including attitudes, behavioral predispositions, and behavioral intention to encourage weaning. One hundred and sixteen medical and nursing students enrolled at a large mid-western University completed an online survey. Participants were asked to provide answers to questions regarding their knowledge of extended breastfeeding, attitudes toward it, perception about stigma associated with breastfeeding, and their behavioral intention to encourage future patients to wean. A lack of knowledge about extended breastfeeding was evident among the medical and nursing students; they also exhibited increasingly negative attitudes toward extended breastfeeding as the child's age increased. Medical and nursing students' behavioral intention to encourage weaning is associated with their pre-dispositional stigma of extended breastfeeding. Addressing stigma and negative attitudes toward extended breastfeeding in pre-healthcare students' curriculum may help future healthcare providers understand that while cultural norms in the United States do not tend toward extended breastfeeding, it is more common in other parts of the world, as well as help them understand health benefits to the child and to the mother.