Sad statement about the world today: they recommend giving infants vitamin D supplements and avoiding exposure to sunlight. If you must have your infant exposed to sunlight, strong sunscreen is recommended. All this because exposing infants to a bit of sun but not too much, is apparently bad as it call for exercising judgment.
Also, there have been difficulties in issuing guidelines for minimum sun exposure, Those who traditionally provide such guidelines don't want to issue guidelines which call for using judgment. Also such the recommendation should vary by skin color and this will likely be a source for both misunderstandings and claims of racism.
Kelly found one site that says 10-15 minutes twice a week. We'll see how that works.