First of all, diarrheal disease is a common symptom caused by a group of multi-factors and multiple etiologies, which mainly refers to the change of stool properties and increase in the number of times, and is a common disease in pediatrics. That is easy to cause diarrhea in small children for the following reasons: 1, physical problems: children’s organs are not yet well developed, especially some children’s gastrointestinal tract is not well developed, and children’s growth and development process requires more energy, things eat more, easy to cause gastrointestinal burden resulting in diarrhea. 2, infection: including infections inside the gastrointestinal tract, such as viral infections, like rotavirus, norovirus and other infections, or bacterial infections, or bacterial infections. Norovirus and other infections, or bacterial infections, parasitic infections can also cause diarrhea. Also include infections outside the gastrointestinal tract, such as respiratory tract infections, urinary tract infections or infections in other parts of the body may also cause diarrhea; 3, abuse of antibiotics: the application of antibiotics will kill the normal flora inside the intestinal tract to a certain extent, causing dysbiosis will also cause diarrhea; 4, dietary problems: a feeding of too many things too mixed, this way the child can not digest, or should not feed When fed, such as 2, 3 months, add meat, rice paste, etc., are caused by indigestion, diarrhea; 5, climate change: the climate suddenly changed, will also cause intestinal tract dysfunction, diarrhea. So all these factors make children more prone to diarrhea.