Level 1: What is infant diarrhea? Diarrhea refers to an increase in the number of stools, a decrease in stool volume, a pulpy or watery texture, and is accompanied by symptoms such as abdominal bloating and abdominal pain. Diarrhea is common in 4-month-old babies. The intestines of infants are more sensitive than those of adults and are easily disturbed by various factors and cause diarrhea. There are many causes of diarrhea in babies, including viruses, bacteria, parasites, allergies, etc. Level 2: How to