Breast-fed infants and vitamin D supplements
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More infants were vitamin D deficient during winter (37 percent) than during summer (2 percent), and more dark-skinned than light-skinned infants were deficient (43 percent versus 6 percent). A second study investigated breast-fed babies from ages 4 to 15 months and found that deficiency is less prevalent as babies get older.
It wasn't always this way. At the beginning of the last century, it was standard practice to give infants a teaspoon of cod liver oil, which averages about 440 IU of 25-OHD per day. When the use of baby formula became popular, enough vitamin D was added to the formula to prevent deficiency. The American Academy of Pediatrics recommends vitamin D supplements of 200 IU per day for breast-fed infants. The proviso that supplements may not be required if there is adequate exposure to sunshine, but this was never defined. If you are breast feeding your baby, you likely take Vitamin D. If not, check with your pediatrician as to how much of the vitamin you should take.