There are several causes of vomiting and diarrhea in infants: first, infants with gastrointestinal indigestion caused by improper feeding will experience vomiting and diarrhea; second, infants with cold abdomen will experience vomiting and diarrhea; third, if infants are infected with viral enteritis caused by viruses, they will experience vomiting and diarrhea, which can also be accompanied by fever; fourth, infants with bacterial infection of the stomach and intestines, causing acute gastrointestinal inflammation or bacterial enteritis, will experience vomiting and diarrhea, most of which will be accompanied by fever, and can be treated with anti-inflammatory and symptomatic treatment.