1. Symptoms of diarrhea in babies Diarrhea refers to an increase in the number of bowel movements per day, an increase in the amount of stool, thin or watery stool, and is accompanied by varying degrees of abdominal bloating, abdominal pain, nausea, vomiting and other symptoms. If your baby develops these symptoms, you need to seek medical attention promptly. 2. Dietary principles that should be followed during diarrhea. During the baby\’s diarrhea, the following dietary principles should be followed.