2 months of the baby 3 days without stool may be a normal physiological phenomenon, may also be functional dyspepsia, megacolon and other conditions. 1. physiological phenomenon: usually the baby is younger, the digestive function is not yet well developed, it is possible to appear 2 months of the baby 3 days without stool, is a normal physiological phenomenon. 2. Functional dyspepsia: usually caused by a combination of factors, considerations and visceral sensory hypersensitivity, gastrointestinal dyskinesia, gastric tolerance to food diastolic function decline, genetic, Helicobacter pylori infection and other factors. There will be postprandial fullness, early satiety, middle and upper abdominal pain and other symptoms, and can also be accompanied by constipation, reflux and other conditions, which can also be manifested as a 2-month-old baby 3 days without stool. 3. Megacolon: mainly low intestinal obstruction caused by various reasons. Usually neonatal patients with congenital megacolon will often appear in the phenomenon of delayed expulsion of fetal stool, which can also appear in the 2-month-old baby for 3 days without bowel movement. The patient may be accompanied by abdominal distension and constipation. It is recommended that 2-month-old babies 3 days without stool, parents first exclude physiological factors, if the disease is caused, but also need to consult a doctor for timely treatment.