One reason that mothers often give up breastfeeding or choose to feed their babies with “supplemental” infant formula may be that certain physiological effects that occur in infants as a result of formula feeding are mistakenly viewed as signs that babies are more satisfied or content than they are while feeding on breast milk alone. Specifically, babies who are fed formula tend to sleep for longer periods after feeding, and tend to demonstrate hunger cues less frequently than exclusively breastfed babies do.