Calcium carbonate preparations are preferred for infants, and are commonly used clinically, such as DiQiao and Lundy. Baby calcium deficiency in infancy and dietary calcium deficiency, as well as vitamin D deficiency are related. In this case, baby calcium supplementation what kind of calcium baby absorbs well, first of all, the source of calcium should be safe, among the many calcium supplements, purified and refined calcium carbonate from ore contains lead, which may be much lower than calcium supplements made from marine organisms and animal bones as materials, and it is recommended that it can be used as the drug of choice for calcium supplements. Next, pay attention to the amount of calcium content, calcium carbonate can contain up to 40% calcium, so calcium carbonate is preferred, while calcium gluconate contains only 9% calcium. Pay attention to the absorption rate of calcium, the highest absorption rate is also calcium carbonate, the lowest is calcium gluconate, also pay attention to the taste of calcium preparations.