The amount of vitamin D the mother has while she is pregnant determines the levels of vitamin D the baby will have, so it is very important mothers stay healthy and keep good levels of nutrients while pregnant. Though it is not likely to occur in the United States it is still seen occasionally, mainly in babies who are breastfed for too long because breast milk does not contain enough vitamin D the infant needs for proper growth. Fortified milk has decreased the problem in the United States tremendously (Sroda, Rebecca). Often times, if the mother does not have adequate vitamin D levels, the doctor will prescribe a vitamin D supplement while the mother is still breast feeding to ensure the child is getting enough nutrients. Not getting proper amounts of vitamin D or calcium within ones diet, or if the nutrients are not correctly absorbed will cause low blood calcium levels, which is known as hypocalcemia. Sunlight is very important in preventing rickets because it is a very good source of vitamin D. Because children in Africa have such dark pigmented skin, it is harder for them to absorb vitamin D through the sun. Rickets can be genetic, but is not very common, this is called hypophosphatemic hereditary rickets; it prevents the kidneys from taking in phosphate the way they normally would which is responsible for forming the bones and teeth in the