The child is 6 years old. It's very hot these days. He turns on the tap water shower from time to time. What's the harm to him?

Cold water washing will not only make you cool, but will make you feel worse, and the child is still so young that cold water is definitely not acceptable! When summer is hot, children's pores are open when they are hot. If the pores are punched with cold water, the pores will shrink instantly, the coolness on the skin will be locked in the body, and the body will produce moisture. Once moisture accumulates, it will cause serious harm to the body and affect the development and health of joints.