Lactose is the primary sugar in milk. It is not contagious or cancerous. Slow weight gain, growth and development. Gas and bloating.
Lactase is necessary to digest all milk except mother's milk.
Without it, sugars in milk absorb fluid and cause diarrhea. Although some infants are born with the disorder, lactose intolerance usually develops in adulthood. Temporary lactose intolerance can occur in an infant after a severe bout of gastroenteritis that damages the intestinal lining. If you are pregnant and there is a history of lactose intolerance in your family, consider breast-feeding your baby. If not, you may need an alternate non-milk formula.