In general, infants do not need routine calcium supplementation, and those with calcium deficiency should take medication under the guidance of a doctor. Infants refers to the baby from birth to one year of age, in its two weeks after birth to start routine supplementation of vitamin AD drops, but within 6 months of the baby, exclusively breastfeeding, generally no additional supplemental calcium, more than 6 months of babies, began to add complementary foods, if it is not effective in obtaining sufficient calcium from food sources, there are calcium deficiency manifestations of the person, can be given to the calcium supplementation. The main manifestations of calcium deficiency in infants are sleep disturbance, night crying, excessive sweating, especially the head, occipital baldness; late closure of fontanel, late eruption of milk teeth; chest with rib crosstalk, chicken chest and funnel chest. If the baby has any discomfort, must go to the regular hospital, under the guidance of the physician treatment, do not take their own medication to deal with, so as not to delay the condition.