The main source of calcium in the infant body is milk food, if the daily milk intake of infants to ensure adequate, usually do not need additional calcium supplementation. For breastfeeding small infants, mothers need to pay attention to daily calcium supplementation; larger infants can add complementary foods, in the absence of allergies and other special circumstances, can be appropriate to eat more river shrimp, soybean products, seaweed and other foods containing more calcium. In addition, in calcium supplementation first need to emphasize the reasonable supplementation of vitamin D. Usually, normal babies are supplemented with 400 units of vitamin D per day starting a few days after birth; for preterm babies, twin babies and other high-risk children, they need to be supplemented with 800 units until three months later when it is changed to 400 units per day until they are two weeks old. Vitamin D can be suspended or reduced in the summer when adequate sunlight is available. Special babies, such as those with manifestations of rickets or recent acute infectious diseases and high body wastage, may be given temporary short-term supplements of calcium, such as milk calcium and calcium carbonate.