4-year-old child stomachache fever diarrhea how to return a responsibility

4-year-old child has abdominal pain, fever and diarrhea symptoms, which is likely due to acute gastroenteritis caused by lesions, and eating unclean food has a lot to do with intestinal bacterial infection. If the child diarrhea symptoms are more serious, can be given montmorillonite powder and rehydration salt treatment.