There is no clear rule on how long a child should take calcium supplements in a year, it depends on the child’s calcium deficiency and the digestion and absorption situation, and cannot be generalized. If children show obvious symptoms of calcium deficiency, they can take calcium supplements, such as calcium gluconate oral solution, which is the most suitable for children to take orally and is easily absorbed and has the best effect. In addition, you can also take vitamin D orally, vitamin D has the ability to promote the absorption of calcium, calcium and promote the growth of bone development, which is conducive to the growth of children’s height. If only to prevent children from calcium deficiency, usually can eat more calcium-containing food such as milk, soy products. You can promote the synthesis of vitamin D3 in your body by going outdoors more and getting more sunlight to improve the absorption rate of calcium. Therefore, focus on calcium supplementation should first start from the diet, carry out high calcium diet is the fundamental measures to prevent calcium deficiency. In addition, it is necessary to pay attention to not drink a lot of water after calcium supplementation, so as not to dilute the calcium.