For a three-month-old baby, having seven or eight bowel movements a day may be normal, but it could also be a sign of gastrointestinal problems. In this case, it is recommended to administer oral pediatric pancreatin and Biqui, taking the two medications an hour apart. At the same time, a belly button patch can be used, and precautions should be taken to keep the abdomen warm. The diet should consist mainly of light, easily digestible foods, and ensure the baby consumes enough fluids to prevent dehydration. These are suggestions for the question ‘What to do when a three-month-old baby has diarrhea,’ hoping it will be helpful to you. Wishing you health!