How to deal with diarrhea in newborn babies? Newborn babies are prone to diarrhea, which can be worrying and unsettling for parents. How to handle this situation correctly? Let’s explain it from several aspects below. How to diagnose diarrhea in infants? First, determine whether the baby actually has diarrhea. Under normal circumstances, babies change diapers 8-10 times a day and have 2-3 bowel movements, which is within the normal range.