1. Why do children need calcium supplements? Calcium is an important element in bones and teeth and is essential for children\’s growth and development. During growth and development, children need a large amount of calcium to support body development and bone formation. A lack of calcium can lead to problems such as osteoporosis and brittleness. 2. What are the methods of calcium supplementation for children? 1. Food calcium supplementation: Milk, tofu, cheese and other foods rich in calcium can help children supplement the calcium they need.