Pediatric diarrhea is caused by a variety of pathogens and factors, characterized by an increase in the frequency of bowel movements and changes in the characteristics of stools. It is one of the most common diseases in infants and young children in China, with a high incidence in infants and young children from six months to two years old, half of which are under one year old. It is one of the main causes of malnutrition and growth and development disorders in children. Diarrhea has some common manifestations, including loss of appetite, occasional regurgitation or vomiting, increased frequency of bowel movements, watery or thin stools that are yellow or yellow-green, some with a sour smell. In severe cases of diarrhea, it is important to check for dehydration and electrolyte disorders, as well as symptoms of systemic infection and intoxication, such as fever, irritability or lethargy, drowsiness, pale complexion, and even coma and shock.