Breastfeeding babies generally don't need to be burped as frequently as bottle-fed babies. Babies need to be burped after they swallow air during a feeding. There is no air in the breast, and the breast fills the baby's mouth, which keeps air out, explains Shirley Donato, a registered nurse and certified lactation consultant at Virtua Hospital in New Jersey. However your baby may have swallowed air when crying before a feeding. In addition, if your milk comes out fast at the beginning of the feeding, your baby might gulp air in at that time. Express a little milk before starting the feed to slow down the flow.