Calcium supplementation should follow the principle of individual, seasonal and local adaptation, and excessive calcium supplementation is harmful but not beneficial. From the perspective of normal human metabolic characteristics, it is safest to achieve calcium intake through diet. Only when suffering from certain diseases or during certain special periods when the intake is confirmed to be inadequate, should one consider whether to take calcium supplements. In addition, there is the issue of absorption to consider. Parents can grasp the following principles when giving their children calcium supplements: 1. Ensure a daily intake of 250~500 grams of milk or yogurt. 2, adhere to the daily outdoor activities for at least 1 hour, more sunshine can increase the body’s own synthesis of vitamin D, in order to promote the body’s absorption of calcium. 3, eat more green leafy vegetables, green leafy vegetables in the vitamin K is good for long. 4, eat more bean food, which the soy isoflavone component is beneficial to the growth and development of children. When sunbathing, try to expose more skin, which can increase the synthesis of vitamin D and promote the absorption of calcium. In addition, you should ensure a reasonable diet every day, and give your child more nutritious, calcium-rich, protein-rich foods, such as dairy products, shrimp, eggs, sesame, seafood and legumes; eat more fresh green leafy vegetables and fruits, such as spinach, carrots, oranges, etc. These are helpful for your child to replenish the calcium needed for body growth and development. In addition, children in the growth and development period is best not to eat or eat less convenience food, fast food, as far as possible not to eat or eat foods containing preservatives and anti-seasonal foods that are likely to cause precocious puberty.