Calcium is an important component of the skeleton. About 99% of calcium in our bodies can be found in the bones and teeth. Calcium is important for the development of bones and is therefore especially important during children’s growth. A deficiency in calcium in children can lead to impaired growth and deformation of the bones. In infancy and toddlerhood the need for calcium is higher than at other stages of life. The absorption of calcium in the body is controlled by vitamin D and is reduced by a poor vitamin D supply. Therefore, sufficient vitamin D is just as important as sufficient calcium.