There are many reasons why children sweat a lot at night, mainly considering the following aspects: First, normal physiological phenomenon, because children have fast breathing and heart rate, fast metabolism, and naturally sweat more than adults. The second aspect is that parents are too worried about their children getting cold and like to cover them with a thick blanket at night, resulting in more sweating. Thirdly, if the child has been repeatedly sick recently and is weak, this can also lead to excessive sweating. Fourthly, children with calcium deficiency may also show excessive sweating. In these cases, we should pay attention to the child’s symptoms and signs to analyze what causes the excessive sweating and choose a targeted treatment.