Eight-year-old children if the body does not lack calcium elements, generally after drinking milk does not need additional calcium supplement, if the body itself has a calcium deficiency, drink milk after the need for medication calcium supplement. Eight-year-old children itself is relatively fast growth and development, if the lack of calcium may appear after the phenomenon of excessive sweating, if the daily fixed let the child drink a sufficient amount of milk, in the case of the body does not lack of calcium, generally do not need to additional supplement. So in the extra to the child calcium supplement, it is recommended to go to the hospital for relevant tests, if the lack of the case before using drugs will be safer, otherwise it may lead to oversupplementation, causing calcium poisoning. It is recommended that moderate exercise, such as jumping rope, playing basketball, swimming and so on, are better for the child’s bone development.