Calcium Carbonate D3 Granules is a nutritional supplement mainly used to supplement calcium and vitamin D. Infants are usually given half a packet once a day by mouth with warm water. Most infants are breastfed or formula milk, which is rich in calcium, and most do not need additional calcium supplements, and can take vitamin D orally every day. If there are obvious symptoms of calcium deficiency, you need to go to the hospital to consult your doctor, and depending on your baby’s specific situation, you can choose to take calcium and vitamin D supplements at the same time, or vitamin D supplements alone. If you want to use calcium carbonate D3 granules, infants are usually given half a packet once a day, dissolved in warm water or added to milk powder. This drug is contraindicated if you are allergic to it, and should be used with caution in people with cardiac or renal insufficiency. In conclusion, if you consider that there are symptoms of calcium deficiency, you need to go to the hospital, confirm the diagnosis and then use medication, you need to go to the hospital to consult the doctor before taking.