After children are dehydrated, they will show the following symptoms: 1. thirst, after children are dehydrated, they will have the symptom of drinking water to save themselves, children will talk about thirst, especially older children. 2. the amount of urine is low, because after children are dehydrated, the amount of water excreted through the kidneys is greatly reduced, that is, the amount of urine will be significantly reduced. 3. children will have dry skin, because after children are dehydrated, the water on the surface of their skin will be lost, so their skin is very dry. 4. 4. Children will have sunken eyes and no tears when they cry at a young age.