Vitamin D.
Calcium is also correct.
. While your body needs vitamin D to absorb calcium, you do not need to take vitamin D at the same time as a calcium supplement.
The primary cause of congenital rickets is vitamin D deficiency in the mother's blood, which the baby shares. Vitamin D ensures that serum phosphate and calcium levels are sufficient to facilitate the mineralization of bone. ... Rickets in children is similar to osteoporosis in the elderly, with brittle bones.