For several years now, the American Academy of Pediatrics has recommended that all breastfed babies start getting 400 IU of a vitamin D supplement within the first few days of life. (IU stands for international units, which is a common way that vitamin D is measured.) Quality infant formulas have vitamin D in them. Babies who get 32 ounces of formula per day have their needs covered.
- < 12ng/ml is severely deficient.
- 12-20 ng/ml is still not adequate
- 20-50ng/ml is a reasonable range of normal