The main reason anyone doesn't get enough is because we (collectively) spend too much time not outside. On top of that we tend to slather on loads of sunscreen when we do go out meaning that we don't get our Vitamin D even then. Now this study saying infants are Vitamin D deprived, especially breast fed infants.
That breast fed infants are not getting enough Vitamin D should tell people that we are insanely over paranoid about going outside and the possibility of getting burned. Not that we should have to give an infant a dietary supplement. I know that there are dangers of overexposure to UV and that it is worse than it was 1000 years ago, but it is also overblown. If you are sensible about going outside--don't be outside in the sun from 12-3 unless you have to and then keep covered first use sunscreen second, don't wait until mid summer and 90 degree weather to get sun, if you skin starts to feel warm get in or under cover, ...--then there shouldn't be a problem.
It only takes 15 minutes of exposure to get your Vitamin D. Supplementing this is insanity, not good practice.
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