Level 1: What is diarrhea in two-month-old babies? Diarrhea refers to the symptoms of increased stool frequency, reduced stool volume, thin stool, increased water content, soft or watery texture in infants. Two-month-old infant diarrhea means that the baby with this symptom is about two months old. Diarrhea may be accompanied by other symptoms such as vomiting and fever, and in severe cases may even lead to water loss and electrolyte imbalance. Level 2: What is the cause of diarrhea in two-month-old babies? (1) Infection: Microbial infections such as bacteria, viruses, parasites, etc. may cause diarrhea. (2) Allergy: Some babies are allergic to milk powder or other foods