Fever and diarrhea are as common as colds. Babies with weak resistance and underdeveloped gastrointestinal function are prone to indigestion and infection, leading to diarrhea and fever. Diarrhea is divided into two categories: infectious and non-infectious. Most diarrhea with fever is infectious, including viruses, bacteria, fungi, parasites, etc. According to the severity, it is divided into light diarrhea and heavy diarrhea. The degree of dehydration is divided into moderate, medium and severe, and the nature of dehydration is divided into hypotonic, isotonic and hypertonic dehydration. Treatment options: 1. Adjust the diet and continue to eat Breastfed infants continue to breastfeed and suspend the diet. Artificial feeders can go to lactose formula feeding, rice soup, etc., no recommended diet ban. 2.Medication: (1) Liquid therapy, choose oral rehydration or intravenous rehydration according to the degree of dehydration. (2) pathogenic treatment, bacterial infections can choose to apply antibiotics, viral diarrhea without special antiviral drugs, more antibiotics. 1-year-old baby fever, watery stools, egg-shaped stools, consider viral diarrhea, mainly rehydration therapy to prevent water-electrolyte disorders. (3) Micro-ecological therapy, commonly used Pepcid, Jin Shuangqi, etc. (4) Intestinal mucosa protector, oral montelukast. The condition of children changes rapidly, and diarrhea and fever are prone to dehydration, resulting in electrolyte disorders and organ damage, etc. They need to seek timely medical attention and treatment under the guidance of physicians.