After the HFMD vaccine, some children will have diarrhea, which is a normal phenomenon and is considered to be caused by the side effects of the HFMD vaccine, as it is a kind of fire fighting intestinal virus, so it will produce diarrhea symptoms, parents do not need to worry too much, generally 1-2 days can be a natural recovery, belong to the transient transient diarrhea. If the symptoms of diarrhea are more serious, you can also prepare your own probiotics for your child to take orally, such as the commonly used Mamia and Bifidobacterium, according to the instructions for oral treatment, can play a role in regulating the disorder of intestinal flora, thereby alleviating the symptoms of diarrhea in children. For more serious diarrhea, it is necessary to take the child to the hospital for examination and treatment under the guidance of a pediatrician, and parents must not blindly use antidiarrheal pills for their children.