The difference between infantile dyspepsia and lactose intolerance symptoms is in the stool, mental status, and intestinal tract. 1. Stools: infant indigestion stools are mostly dilute watery or egg-like, and may have a distinct sour odor, bad smell, etc.. Lactose intolerance in infants stools are mostly yellow dilute or with foamy sour odor milk petal-like. 2. mental state: infant indigestion mental state is generally good, sometimes will be quiet, occasionally may be due to abdominal pain and other symptoms of crying. Lactose intolerance in infants may appear restless, irritable mood, more prone to crying. 3. Bowel: Bowel sounds are often normal in infants with dyspepsia, and hyperactive in infants with lactose intolerance, who may experience colic and other discomforts. Parents who cannot distinguish between dyspepsia and lactose intolerance based on the symptoms are advised to take their infants to the hospital in a timely manner.