It is not always necessary to take calcium supplements in the spring, such as children with a clear calcium deficiency need to follow the doctor’s instructions for supplementation. Children should pay attention to the timing of calcium supplementation, can not be supplemented with zinc, calcium and phosphorus ratio is appropriate, as well as the choice of calcium supplements. 1. The timing of calcium supplementation: the best time to supplement calcium between two breastfeeding, generally can be 0.5-1 hour interval after breastfeeding calcium supplementation. Because milk and calcium tablets are rich in calcium, if taken at the same time or the interval between the two is relatively short, due to the gastrointestinal tract within a short period of time the absorption capacity is relatively limited, will cause unnecessary waste. 2. Can not be supplemented with zinc: Because zinc and calcium are divalent ions, both at the same time in the process of supplementation, the ion channel will compete to absorb divalent ions, seriously affecting the absorption of calcium and zinc. So parents should pay attention to the time when the child supplementation of zinc, should be separated from the two elements of the supplementation time, to two to three hours for the best, pay attention to the first supplementation of zinc and then supplementation of calcium. 3. Calcium-phosphorus ratio: when too much phosphorus is ingested in the body, it will form calcium phosphate with calcium, thus affecting the absorption of calcium. Therefore, we need to pay attention to the ratio of calcium and phosphorus, for example, breast milk is generally 2:1 ratio of calcium and phosphorus, will be the most conducive to the body’s absorption of calcium. 4. Calcium choice: preferred calcium content, gastrointestinal absorption, high safety, good taste, easy to take calcium preparations, but should pay attention to the physiological characteristics of infants and young children’s digestive system development is not yet mature, pay attention to the solubility of calcium preparations in vitro. In addition, it is also necessary to pay attention to the child’s diet, as well as vitamin D supplementation and other aspects, when the child needs to carry out calcium supplementation in the spring, it is necessary to carry out under the guidance of the doctor.