Whether children are calcium deficient can be judged from the following aspects: 1, often manifested as excessive sweating, independent of temperature, especially after sleeping head sweating, so that the child’s head constantly rubs the pillow, long after the cranium can be seen occipital bald circle. 2. Mental irritability, disinterest in the surrounding environment, sometimes parents find that the child is not as lively as before. 3.Night terrors, often waking up suddenly at night, crying more than once. 4.Children after 1 year old show late teething, some children still have not teething at 1.5 years old, delayed closure of the front chimney door, often after 1.5 years old still not closed. 5.High forehead protrusion, forming a square cranium. 6, often have beaded ribs, is due to the lack of vitamin D, rib cartilage hyperplasia, each rib cartilage hyperplasia connected like a string of beads, often compressing the lungs, so that children have poor ventilation, easy to suffer from bronchitis, pneumonia. In children with severe calcium deficiency, the muscles and tendons are relaxed. If the abdominal wall muscles, intestinal wall muscle relaxation, can cause the intestinal cavity pneumonia and the formation of abdominal expansion like frog belly. If children learn to walk after the age of 1, calcium deficiency can soften the bones and bend the lower limbs with the weight of the body when standing, some of them have “‘x”-shaped legs and some have “‘O”-shaped legs and are prone to fractures. Some of them show “‘x” shaped legs and some show “O” shaped legs and are prone to fractures. Parents should learn to determine whether their children are calcium deficient according to their performance, so that they can provide their children with calcium-rich foods such as fish, shrimp, kelp, rib soup, and vitamin D-rich foods such as pig liver, lamb liver, and beef liver in time to promote calcium absorption. Generally, children with mild calcium deficiency can improve their calcium deficiency symptoms with dietary supplements. If the symptoms are more severe, vitamin D and calcium supplements can be taken under the guidance of a doctor.