Fall diarrhea mostly occurs from mid-September to December, culminating in October to November. The cause of fall diarrhea in children is mostly due to rotavirus infection. Rotavirus breeds quickly in early autumn when the temperature drops, because children have a weak resistance and are less tolerant than adults, and their immune system cannot adapt quickly to this sudden change in weather, making them vulnerable to the virus. Rotavirus diarrhea, often manifested as egg-flake soup-like thin watery stools, can easily cause dehydration. Rotavirus diarrhea is a self-limiting disease, and the virus usually stays in the body for 5-7 days, with no specific medication. The main treatment is symptomatic support therapy to avoid dehydration and enhance body resistance. To prevent and treat dehydration, oral rehydration salts are preferred, and only severe cases require intravenous fluids to correct dehydration. Home care points: 1, add clothes with the climate, pay attention to abdominal warmth, avoid long-term application of broad-spectrum antibiotics; 2, continue the diet: stop indigestible food, infants can be given formula or low-lactose milk, older children give rice porridge, noodles, etc., resume normal diet after 2 days; 3, diligently change diapers, wash buttocks, prevent diaper dermatitis and episodic urinary tract infection; 4, observe the child’s mental state, record 5.Prevent dehydration: children with mild disease can take oral rehydration salt several times in small amounts under the guidance of the doctor, while babies with severe dehydration need intravenous rehydration; 6.Rational medication: since autumn diarrhea is mostly caused by viruses, there is no need to apply antibiotics, and intestinal mucosa protectors such as Similac can be taken as appropriate, and do a good job in preventing dehydration and replenishing fluids, children can heal themselves within a few days. Self-healing.