Baby stool with sour smell may be a normal physiological phenomenon, this does not need special treatment, may also be caused by indigestion, mainly to medication, adjustment of dietary structure, the specific need for symptomatic treatment, analysis is as follows: 1. Physiological phenomenon: most of the acidic odor of the baby’s stool is a normal physiological phenomenon, because the stool itself as a food residue, after the discharge of the acidic odor is a normal reaction, without special treatment. 2. Indigestion: indigestion leads to sour stools, accompanied by bloating, decreased appetite, etc., usually pay attention to diet to eat less greasy, high-protein foods; if necessary, you need to use drugs to regulate intestinal flora, such as probiotics. All of the above drugs should be taken under the guidance of a doctor, and should not be used on their own.