In addition to congenital genetics, acquired growth and development are also crucial factors affecting height, and calcium plays an important role in growth and development. In the body, minerals account for about 5% of body weight, while calcium is 2%. And the calcium in the body is distributed in the form of solid calcium with teeth and bones, the proportion is as high as 99% of the total, and the remaining 1% is distributed in blood, intercellular fluid and soft tissues. According to the “Dietary Nutrient Reference Intake for Chinese Residents” published in 2016, it is recommended that infants aged 0 to 0.5 years need to consume 200 mg per day and 250 mg per day at 0.5 to 1 year. The peak growth period of infants is before 1 year old, during which the growth of bones and teeth is especially obvious and rapid, and the demand for calcium is also more than that of adults, if calcium deficiency will lead to slow development and stunted growth, while late teething, late toddler, O-legged, etc. are also greatly related to calcium deficiency in newborns. However, children from 0-6 months old do not need extra calcium supplementation. Because breastfed children, breast milk is rich in nutrients and very high in calcium; even if not breastfed, infant formula, calcium content can also ensure the growth and development of infants; so children at this stage do not need calcium supplements. However, when a child has symptoms of rickets, additional calcium supplements are needed on top of vitamin D supplementation. Calcium deficiency in children can be seen from some symptoms, because the physiological function of calcium is important for bone growth and development, then it has a calming effect on the nervous system; if the child appears crying and irritable, night sweats and pillow baldness, if there is this phenomenon, parents should be more alert.