Under normal circumstances, the course of diarrhea in babies is about one week. If your baby’s diarrhea does not clear up in a week, you should take your baby to a pediatric clinic or a pediatric gastroenterology clinic in time to see the cause. Fresh stools within an hour should be taken to the hospital for routine stool tests, occult blood tests, and pathogenic tests such as rotavirus and norovirus to facilitate treatment for the cause. The baby’s diet may be a factor in the recovery of diarrhea, and if considered an enterovirus infection it may be accompanied by lactose intolerance or even food allergies. Therefore, the baby should eat small and frequent meals and can be given lactase to help digest lactose. If food allergy is considered as a factor, the mother should avoid intake of foods that are easily allergic, such as milk, eggs, seafood, etc. If milk protein allergy is considered, the baby should be given a deeply hydrolyzed protein formula or a completely hydrolyzed protein formula. Of course, taking probiotics at the same time to regulate the gastrointestinal function is necessary for babies with diarrhea for a week. You can take yeast dispersion of Saccharomyces boulardii or bifidobacteria type probiotics.