1.What kind of children need calcium supplement? Children are in a stage of rapid growth and development, and their needs for various nutrients are much higher than those of adults. Generally speaking, children who can consume food normally do not need calcium supplements from drugs and health products. Some children with obvious calcium deficiencies, such as night sweats, night terrors, dysplasia, skeletal deformities, thinning yellow hair, etc., need to increase their intake and are recommended to take vitamin D. Some children grow significantly faster than their peers, so these children should increase their calcium intake in appropriate amounts. It should be noted that young children without special factors should not intensify calcium supplementation to avoid adverse consequences. 2.What is the most suitable source of calcium? In terms of absorption, the best source of calcium should be milk and its products. Some children are allergic and are not suitable for dairy products, so they can be supplemented with health products or medicines. Because children’s bodies are in the developmental stage, their metabolism is not strong enough, and the digestion and metabolism of beans may increase the burden on the kidneys, so it is not recommended to consume large amounts of bean products. There are also some children who suffer from indigestion symptoms such as diarrhea when consuming fresh milk, which is a digestive system maladjustment, and they can usually get better after insisting on it for about a month. Or change to yogurt, which is generally tolerated. 3.What should I pay attention to when taking calcium preparations? Generally speaking, there is no need to “avoid” taking calcium preparations. But at present many parents at the same time for the child to supplement a variety of nutrients, which exists in the relationship between the combination. In terms of drug interrelationships, calcium and magnesium are suitable to be taken together to increase the effect of the drug. Calcium and zinc should not be used together, as it will affect the absorption. If you have to apply them together, it is recommended to take them at least two hours apart. Nowadays, many nutritional products are made into compound preparations, which are convenient to take. However, from a medical point of view, it is not recommended to over-apply drugs or supplements. At the same time, there are drug interactions in compounded preparations, which may affect the effect or have adverse reactions. Therefore, it is recommended to apply single-formula preparations, which are easier to grasp and easy to cope with once adverse reactions occur. 4.How do you think about trace element test? Nowadays, many maternal and child health institutions have trace element testing programs, and the test specimens vary. In terms of test accuracy, the venous blood test is more representative. Other tests, including hair and peripheral blood, have limitations and are not recommended.