A 20-day-old baby’s stools have a sour odor, suggesting indigestion. Breastfed babies’ stools are yellow or golden yellow, uniformly creamy, with a few yellow stool particles, occasionally slightly dilute and slightly greenish, not smelly, with a sour odor, 2-4 times a day, and the number of stools usually decreases after the gradual increase of solid food. The stools of formula-fed babies are yellowish and dry. Foul-smelling stools indicate protein indigestion. Sour and frothy stools indicate sugar indigestion. Creamy appearance indicates fat indigestion. Milk petals in the stool, i.e. milk clots, are mostly soap clots synthesized from undigested fat and calcium or magnesium, and are of no clinical significance if the amount is not large.