Oral rehydration is preferred for dehydration caused by infant diarrhea, and currently oral rehydration salts are most suitable for children. Specific use is as follows: 1. Generally, for mild dehydration and good skin elasticity, when the urine volume decreases, 50ml per kilogram of body weight is preferred, such as 500ml for a 10kg child; 2. For moderate dehydration, such as poor mental state, dry skin, significantly reduced urine volume and sunken eyes, reaching the degree of moderate dehydration, the amount of rehydration is 100ml/kg, and the amount of rehydration for a 10kg child is The amount of rehydration fluid for a 10kg child is 100ml/kg, and the amount of rehydration fluid for a 10kg child is 1000ml, which is generally required to be completed within 4 hours, and the amount of rehydration will be further determined after 4 hours according to the amount of continued loss; 3. Therefore, according to the nature of the child’s dehydration to determine what nature of saline supplementation.