1. What is diarrhea in babies? Baby diarrhea refers to an increase in the frequency of defecation in infants and young children, and the stool becomes thin and even watery. Typically, 1-2 bowel movements per day is normal, but every baby is different and some babies may have bowel movements more frequently. 2. Why does the baby have diarrhea? 1. Dietary problems: For example, eating too many fruits, vegetables or