Diarrhea’s stool manifestation is mainly more frequent, more volume, more water, stool color is yellow watery or egg pattern with a small amount of mucus, no fishy smell. Often accompanied by fever, respiratory tract infection symptoms, followed by vomiting, diarrhea within 1-3 days, diarrhea is more frequent, usually more than 10 times a day. Some children may also experience serious consequences such as dehydration, electrolyte disorders and even confusion. It can also be attributed to: fever, vomiting, diarrhea. Pediatric autumn diarrhea is generally caused by four etiological factors: (1) immature digestive function in children, poor activity of gastric acid and enzymes, poor tolerance of food, too much added fat and starch can cause gastrointestinal dysfunction. (2) Pediatric immune system function is underdeveloped, poor regulation, pathogenic bacteria enter the body with contaminated food and cause diarrhea. (3) Viral infection, infant milk utensils are not sterilized or not sterilized thoroughly. Rotavirus enters the body through the mouth and causes infection. (4) Cold and flu cause infection leading to diarrhea. Now that we understand the causes, how do we go about preventing fall diarrhea to avoid the adverse effects on children? I probably summed up a few prevention methods: (1) for breastfeeding infants and young children, must adhere to breastfeeding, because breast milk is rich in immune factors, contains a variety of digestive enzymes and antibodies, suitable for infants and young children gastrointestinal tract digestion and absorption, but also can improve the immune function of the child. Therefore, we should avoid weaning in the fall, in order to prevent weaning to add complementary foods caused by sudden changes in dietary structure, causing gastrointestinal dysfunction, resulting in pediatric diarrhea. (2) Because rotavirus infection is often caused by fecal-oral transmission, so we must prevent the children “disease enters by the mouth”, the usual dietary attention to food utensils should be sterilized by boiling after each use, do not use boiling water, the temperature of the boiling water gradually become lower over time, in time and temperature can not achieve the effect of disinfection. Breastfeeding children pay attention to the cleaning of nipples, pay attention to cleaning nipples before each feeding. Personnel caring for the child should pay attention to hand washing hygiene, do not mouth to mouth feeding, the normal bacteria in the mouth can also cause diarrhea in children. In addition, also pay attention to family hygiene such as pediatric clothing, toys, etc., to give the baby a clean and comfortable environment for growth. (3) pay attention to the cold, with the change of seasons, the temperature difference between morning and evening becomes bigger, increase or decrease clothing at any time. When sweating, wipe off the sweat in time. (4) Pay attention to cross-infection, less public places, when there are children with diarrhea around, pay attention to isolate them. Studies have shown that effective interventions can greatly reduce the incidence of fall diarrhea in children. If diarrhea occurs, it should be treated as soon as possible to relieve symptoms associated with diarrhea. Current treatment of fall diarrhea is based on antiviral, intestinal mucosal protection, and fluid replacement. Clinically, according to the amount of fluid loss oral or intravenous fluid supplementation, to prevent dehydration; oral intestinal mucosal protective agents, to promote intestinal mucosal self-repair; oral microbiological agents to balance the intestinal flora imbalance, improve intestinal function. Effective nutritional intervention can help alleviate the symptoms of pediatric fall diarrhea. As children with diarrhea are attacked by viruses, resulting in lactase deficiency and lactose intolerance, lactose-free milk powder should be used for feeding. Clinical studies have shown that the use of lactose-free formula feeding can significantly improve the effectiveness of clinical treatment for children with diarrhea.