Infants usually need to take calcium supplements when they are deficient in calcium, that is, when they are tested for calcium deficiency. Calcium has a very important role in the development of infant’s bones, teeth, brain, etc. Exclusive breastfeeding can meet the demand for calcium for the growth of infant’s bones, and generally do not need additional calcium supplementation. However, when infants are deficient in calcium, it will cause the occurrence of diseases, such as rickets, so when the child has excessive sweating, night terrors, night cries, mental irritability, thinning, occipital baldness and other symptoms and the test results show that the calcium deficiency, it is necessary to take calcium supplements. It should be noted that, in addition to calcium supplementation through the application of calcium supplements and vitamin D under the guidance of a doctor, infants over 6 months of age can also be improved through diet, such as adding fish, egg yolks and other complementary foods with high calcium content to the baby. When rickets is suspected, it is recommended to go to the hospital in time for early and regular treatment!