Existing research on parental information literacy focuses on parents' ability to evaluate information. This approach does not account for conflicting or unwanted information and obscures the emotional impact of unsought information. We aimed to (1) document the sources women use most frequently for accessing breastfeeding information, (2) explore the reasons women choose some sources over others, (3) test the relationship between source characteristics and breastfeeding self-efficacy, and (4) determine the extent to which four source characteristics - competence, trustworthiness, goodwill, and social support - predict breastfeeding self-efficacy. This study was conducted in two phases. The first phase consisted of interviews and focus groups, which we analyzed inductively using a grounded theory approach. In phase two, we conducted a cross-sectional survey of women who were currently breastfeeding, collecting data on the source credibility and social support associated with the source they use most frequently and the participants' breastfeeding self-efficacy. We used multiple regression to analyze our survey data. The frequency with which our participants encountered conflicting and unsought prompted them to view sources that combine expertise and social support as ideal. However, these sources are often difficult to access, leading to a reliance on online sources. This compromise has implications for breastfeeding tenure, as both competence and social support predicted breastfeeding self-efficacy. This study demonstrates how emotional aspects of information seeking shape women's preferred sources, how accessibility limits the use of preferred sources, and how source competence and social support influence breastfeeding self-efficacy.