Calcium is an important nutritional element in the body. Healthy, safe and scientific calcium supplementation is the only way to promote the growth and development of children and help them grow taller. Especially for infants, daily intake of appropriate calcium supplements can promote growth and development. Food calcium supplementation is the safest and most effective method. Regardless of the age of children, it is recommended to consume calcium-rich foods. Milk and milk products, green leafy foods such as lettuce, broccoli, chard, soy products, nuts, seafood, black fungus and meat are rich in calcium. Milk is rich in nutrients and is the best source of calcium for the human body, and the calcium-phosphorus ratio is very appropriate and conducive to calcium absorption, so milk is the best calcium supplement food for children. Breastfeeding is recommended for babies within 0-6 months of age. A healthy mother’s breast milk can meet the calcium needs of a full-term baby, but the vitamin D content in breast milk is low and needs to be properly supplemented with vitamin D to promote calcium absorption and prevent vitamin D deficiency rickets. Premature babies and low birth weight babies need calcium supplements. babies over 6 months old start to add complementary foods, in addition to eating breast milk, infant formula, more of these calcium-rich foods, as long as the diet is balanced, to ensure adequate intake of dairy products, no picky eating, partial eating, conducive to maintaining the normal concentration of calcium in the body, no additional calcium supplements. If the child’s diet is unreasonable and unscientific, and if the child is a serious picky eater, the calcium intake should be supplemented with calcium. Reasonable diet, calcium-rich food intake, food diversification and appropriate outdoor exercise can help meet the demand for calcium and other nutrients, which is beneficial to health.