At 6 months old, after switching to a two-stage milk formula, the child began experiencing diarrhea, with feces resembling egg whites, occurring approximately five times a day. This may be due to catching a cold, breastmilk-induced diarrhea, viral infection, enteritis, or dysbiosis. It is important to pay attention to proper feeding, maintain hygiene, avoid catching a cold, and can take symptomatic anti-inflammatory medication such as Simethicone and pediatric umbilical cord plasters for treatment. If necessary, it is recommended to visit a large hospital for regular stool examination to confirm the diagnosis and treatment.