When babies are not deficient in calcium, they often do not need to take extra calcium supplements. Excessive calcium supplementation will also have adverse effects on the child’s body. Excessive calcium supplementation for babies will have adverse effects on their bodies, such as too much calcium orally in a short period of time, the excess calcium in the body needs to be excreted through feces, which may increase the burden on the child’s stomach and intestines, leading to anorexia, indigestion, constipation and other symptoms. Excessive calcium supplementation over a long period of time will inhibit the absorption of iron and zinc, which in turn will cause secondary zinc and iron deficiencies, and in the long run, the child may suffer from a decline in immunity, anemia, slow growth and other problems. In addition, if the blood calcium concentration is too high it will affect the child’s internal organs or tissues, for example, calcium deposits around the cornea of the eye, which can easily affect the child’s vision. Therefore, when the child is not deficient in calcium, there is no need to take extra calcium supplements. When the child is deficient in calcium, he/she should go to a regular hospital and apply calcium supplements under the guidance of a doctor.