“Did you ever go to bed and wonder if your child was getting enough to eat?” For food insecure mothers, the worry is constant, and babies are at risk of going hungry. Through compelling interviews, Lesley Frank answers the breastfeeding paradox: why women who can least afford to buy infant formula are less likely to breastfeed. She reveals that what and how infants are fed is linked to the social and economic status of those who feed them. She exposes the reality of food insecurity for formula-fed babies, the constraints limiting mothers’ ability to breastfeed, and the lengths to which mothers must go to provide for their children. In a country that leaves the problem of food insecurity to charities, public policies are failing to support the most vulnerable populations. Out of Milk calls out the pressing need to establish the economic and social conditions necessary for successful breastfeeding and for accessible and safe formula feeding for families everywhere.