Pediatric diarrhea is generally caused by two types of causes: non-infectious and infectious. Non-infectious causes: 1. Inappropriate feeding, such as increasing the amount of milk too quickly, adding too much sugar in the milk, suddenly changing milk {such as human milk for cow’s milk}, as well as improperly increasing complementary foods, not following the principle of “from less to more, from thin to thick”. 2, physiological diarrhea, to the child’s nutrients more than the child needs and the limits of digestive function and diarrhea, such diarrhea is mostly seen in small infants within 6 months of age. 3, physical factors stimulation, feeding raw and cold food, abdominal cold, etc. 4, systemic diseases other than the digestive tract, some diseases directly affect the function of the digestive tract, and make food is not easily absorbed and cause diarrhea, such as: pneumonia, meningitis, sepsis, colds can cause diarrhea in children. Infectious causes: 1, bacterial infection, mainly Escherichia coli and dysentery bacillus infection, more common in the summer, mostly due to unhygienic diet, caused by direct contamination of the mouth, while the body resistance of children is not as good as adults, coupled with the hot season will inhibit the production of digestive enzymes in children, so there are more chances of diarrhea in children. 2, viral infection, mainly caused by enterovirus or rotavirus infection, the former mostly occurs from May to September, the latter mostly occurs in the autumn and winter season, the infection route is also from the infection of the digestive tract. In short, pediatric diarrhea is a syndrome, caused by a variety of causes, in the case of pediatric diarrhea, first of all to identify the causes, and then symptomatic treatment, such as improper feeding caused by the main should adjust the feeding, without the application of a large number of antibacterial agents, while the real bacterial infection caused by diarrhea, to lose no time to apply antibacterial drugs, and timely consultation with a doctor.