How old your baby is when you start calcium supplementation needs to vary from person to person. If your baby eats enough milk on a daily basis and does not have night terrors, occipital baldness, or excessive sweating, there is no need for additional supplementation. After being absorbed by the baby’s body, calcium will directly enter the bones and promote bone development. 1. For babies before 6 months of age, the calcium in breast milk or milk powder can satisfy the daily needs of the body, so there is no need to take extra calcium supplements. 2. The amount of milk consumed by babies who start to eat complementary foods will drop. Depending on the daily diet, if the baby drinks enough milk every day (about 300ml), or often eats high-calcium foods such as cheese and milk tablets, there is no need to take extra calcium supplements. 3. If your baby has obvious symptoms of calcium deficiency such as excessive sweating, night terrors, convulsions, and deformed bone development, you need to take timely calcium supplements after checking in the hospital and following the doctor’s instructions. Note that if the baby belongs to preterm babies, it may be necessary to take vitamin D supplements around 15 days or 1 month after birth to promote the absorption and conversion of calcium.