Intolerance to cow's milk and soy proteins may produce fussiness, flat
us, cramps, vomiting, or colic symptoms in infants. These manifestatio
ns may be avoided through the use of human milk. Alternatively, feedin
g infants with hydrolyzed formula may alleviate these symptoms. One co
rrelate for these changes is the microbiologic colonization of the int
estinal tract. This study shows that infants fed a hydrolyzed protein
formula for formula intolerance have increased recovery of anaerobes a
nd reduction in stool pH that are associated with symptomatic improvem
ent.