Calcium supplementation for 4-year-old children can follow the doctor’s advice to eat calcium tablets, calcium-rich foods, etc.. Calcium supplement can eat calcium tablets containing vitamin D. In addition to taking calcium tablets to supplement calcium, eat more calcium-rich foods, such as soybean products, shrimp, large bones, etc., and at the same time more outdoor exercise, sunshine can also supplement calcium. Because every baby’s growth and development process is different, so parents in the child’s calcium supplement before the best first to the hospital to the child to do a micronutrient examination, to determine the child needs to supplement calcium and then in the doctor’s advice to choose the appropriate calcium supplement products. The combination of outdoor exercise and a high-calcium diet while taking calcium supplements can achieve twice the result with half the effort.