Cow's milk-protein allergy is relatively common in both formula-fed and breast-fed infants and can cause colitis that is characterized by rectal bleeding and often loose stools with or without mucus. Cow's milk allergic colitis (CMAC) is usually diagnosed presumptively (instead of by biopsy) and is treated by changing to an extensively hydrolyzed casein formula (EHCF) or by eliminating dairy in the mother's diet …