After your baby finishes on one side, try burping before switching breasts. Sometimes, the movement alone can be enough to cause a baby to burp. Burp your baby every 2 to 3 ounces (60 to 90 milliliters) when you start bottle-feeding. Some infants need more burping, others less, and it can vary from feeding to feeding. If your baby spits up a lot, try burping more often.