1. What is calcium? Calcium is one of the essential nutrients for the human body. It is not only an important component of bones and teeth, but also participates in many physiological processes. The calcium content in the human body is about 1 kilogram, of which more than 99% is stored in bones and teeth. 2. Why do babies need calcium supplements? Calcium is essential during baby\’s growth and development. Because at this stage, babies need a lot of calcium to build healthy bones and teeth. If there is a lack of calcium, it will lead to problems such as poor physical development and susceptibility to diseases in babies. 3. Which foods are rich in calcium? 1. Dairy products: