Calcium and vitamin D are important as they make bones stronger.
Calcium is an important building block for bones. Vitamin D is essential for normal development of bones and teeth and for boosting the immune system, which is not yet fully developed until the third year of life. In addition to vitamin D, vitamins A and C also help to support the immune system.
Even though our body can generate vitamin D on its own, exposure to sunlight is one way to help increase vitamin D levels. This is not always possible, however, especially during the winter months, which is why other sources of vitamin D are important. There are only a few foods that can supply our body with sufficient amounts of this essential vitamin. In theory, without exposure to sunlight kids would have to eat 10-12 eggs, 1 kg of button mushrooms, 1.5 kg of cheese and more than 125 g of salmon.