Calcium deficiency in infants should be treated with calcium supplementation in a timely manner, otherwise it will cause the child to convulsions, and at the same time affect the child’s growth and development, resulting in the child to appear chicken chest, O-shaped legs, X-shaped legs and other bone development deformities, and even affect the child’s height. In fact, infants calcium deficiency is not rare, most are due to vitamin deficiency and lead to calcium non-absorption, due to rapid growth and development of infants and young children, the demand for vitamin D is large, so the general need for routine supplementation of vitamin D, full-term babies are generally two weeks after birth to start supplementation of vitamin D, preterm babies supplementation is even earlier, generally one week after birth to start supplementation, otherwise the lack of vitamin D, the baby is More likely to have sleep easy to wake up, easy to cry at night, tossing and turning, night sweating, grunting and other symptoms, and in serious cases can lead to the child to appear square skull, chicken chest, rib ectopia, X-shaped legs, O-shaped legs and other skeletal deformities, leading to the child to appear rickets. Therefore, infants should supplement calcium in time when they are deficient in calcium, and the calcium supplements include pediatric diclofenac granules, londe calcium granules, calcium acetate, etc. It is also necessary to supplement vitamin D, including Icosin vitamin AD capsule or Star Shark vitamin D3 capsule, and usually get more sunshine to promote the absorption of calcium.