Babies aren't lactose intollerant. Breastmilk has lactose. Lactose intollerance may start to develop at around age 3. If your baby is breastfed and gaining more than 4 ounces a week he may be eating too much or getting too much low fat milk that comes at the beginning of a feeding. Using only one breast a feeding can help. If your baby is formula fed then there could be problems with the formula. Some babies need expensive special formula that has been predigested. Soy formula is the worst formula for brain development and should only be used in babies that have genetic diseases like galactosemia or PKU according to the AAP.
at 12:02 PM on Jun. 4, 2011