Diarrhea can easily cause dehydration in children, so it is recommended to drink water rich in electrolytes when your child has diarrhea, which can effectively prevent dehydration caused by diarrhea. However, there are two situations in which a child with diarrhea must see a doctor: 1. The condition is very serious, such as high fever, very poor mental condition, severe vomiting, etc.; 2. The diarrhea has caused the child to show signs of dehydration. If the child has not urinated for 4 hours, the oral mucosa is dry, and there are no tears when crying, these are early signs of dehydration. In this case, it is important to take the child to the hospital in time for rehydration treatment, otherwise there is a risk of aggravating the condition. In case of diarrhea, it is recommended to give your baby: 1. apple juice; 2. deflated cola (for children over 3 years old); 3. rice soup (after the water is boiled, put in rice, cook for 10 minutes and turn off the heat to take the rice soup). All these liquids are rich in electrolytes and can effectively prevent dehydration caused by diarrhea.