Decreased blood calcium can be given oral calcium carbonate, osteotriol and intravenous calcium gluconate, and usually can get more sunshine. Decreased blood calcium can easily cause convulsions, and for children, it can also affect growth and development, so decreased blood calcium needs to be given active treatment. First, you can deal with the symptoms, give supplemental calcium carbonate and osteotriol, these two drugs, one is the raw material of calcium supplementation, the other is the carrier of transportation, can achieve the purpose of effective calcium supplementation, in the convulsive seizures can be given to intravenous drip calcium gluconate. In addition, in ordinary life, for children with calcium deficiency, you can sunbathe more, which can promote the synthesis of vitamin D, the effect of calcium is still good. Secondly, we should look for the cause of the disease. If it is caused by dietary factors, then pay attention to more bone soup. In addition, if it is caused by chronic renal failure or even uremia, then while taking the above drugs, pay attention to the treatment of the underlying causes.