In the hot summer, it is necessary to give children the following substances to regulate their physique and ensure their health. The first thing is to make sure that children are well hydrated. Because the weather is very hot in summer, children’s bodies consume too much water, so it is necessary to give children timely hydration. After sufficient hydration, it can ensure the smooth blood circulation of children’s body and sufficient water in the body, the probability of children getting sick will be greatly reduced. The next thing is to provide children with vitamin C and other micronutrients in a timely manner, because children are often constipated in the hot summer due to lack of water. When children are given vitamin and fiber-rich foods such as green vegetables and fruits, their stools will flow smoothly, which will reduce the probability of children getting sick.