It is better for infants to take milk calcium because it is naturally derived from cow’s milk and its main components are calcium phosphate and calcium citrate, which are more easily absorbed by infants and have a higher calcium content. Calcium carbonate has a low calcium content, and if you have a poor spleen and stomach, you may suffer from gastrointestinal discomfort and diarrhea. However, lactated calcium is generally more expensive, and if the spleen and stomach function is normal, calcium carbonate can be taken, depending on the physical condition of the baby. Parents can choose calcium supplements according to the baby’s condition and economic situation, but parents should also pay attention to the right amount of calcium supplementation, not the more the better.