Four stools a day in a 15-month-old baby is considered normal if the stools are normal in character, the baby is eating a lot and gaining weight. If the stools are loose and crying, diarrhea should also be considered. The gastrointestinal function of 15-month-old babies is developing gradually, and most of them have bowel movements once a day or once every two days. If your baby has four bowel movements a day, as long as the stools are normal in character and there are no symptoms of abdominal pain, and your baby eats more and gains weight normally, this is also considered normal. If the stool has been frequent, although there is no abdominal pain and other symptoms, the child’s weight gain is slow, and even affects the development, also considered abnormal situation. If the stools are loose and the baby has abdominal pain, cries more than usual, and has a decreased appetite, also consider diarrhea, and you need to take your child to the hospital in time. Try to take your child to the hospital to check the cause of frequent stools and treat it if necessary.