Despite broad recognition of benefits associated with breastfeeding, rates in the United States continue to be below targets established by Healthy People 2020, especially for economically disadvantaged women. This study engaged field-based professionals through a focus group process to collect perceptions on factors that determine a woman's decision to breastfeed. Field-based professionals participated in one of six focus groups. Following the social ecological model (SEM), focus group questions addressed barriers and contributors to breastfeeding at the individual, interpersonal, community, organizational, and public policy levels. Thematic content analysis was used in identifying, analyzing, and reporting on themes within the focus group data. Commonly reported themes were identified that negatively influence a mother's decision to breastfeed such as modesty/general discomfort to breastfeed in front of others, negative breastfeeding perceptions of family members, friends, boyfriends and co-workers, breastfeeding not being viewed as the societal "norm", and the availability of free formula samples. Despite identified barriers, commonly reported themes that positively influence a mother's decision to breastfeed included general knowledge on the benefits, positive breastfeeding perceptions of family members, friends, boyfriends, and co-workers, the availability of "mom and baby" groups, and Baby Friendly hospital practices. The findings provide field-based perspectives that identify opportunities to support breastfeeding through the lens of the SEM. Opportunities to better support breastfeeding include educating mothers and their social support systems on the specific benefits of breastfeeding, challenging existing breastfeeding norms, and working with hospitals on establishing policy to not provide free formula samples.