When to take calcium supplement for newborns, when according to the actual situation, there is no fixed time. Usually, newborns are not deficient in calcium and usually do not need additional calcium supplements. However, when they are found to be deficient in calcium, they need to take calcium supplements as prescribed by the doctor. Under normal circumstances, breast milk or milk powder contains a certain amount of calcium, which can supplement the calcium needed by newborn babies, so usually newborn babies do not have a calcium deficiency and usually do not need to take additional supplements. However, if there are special circumstances or symptoms and manifestations of calcium deficiency, in the test, found that there is indeed a calcium deficiency, then under the guidance of the doctor in a timely manner to supplement calcium. Therefore, there is no clear time standard for newborns to take calcium supplements. Specific should follow the doctor’s advice.