Are they ( AAP) aware of what happens to a baby with extremely low vitamin D levels? Namely cardiomyopathies (enlarged heart), rickets, easily broken bones that look like child abuse and a lot more subtle things like increase infections and a weekend immune system! All these can be minimized or prevented by vitamin D. Of course I must say again vitamin D is NOT vitamin but a pro hormone and is a substance that travels to 2000 genes in the body. In other words every major and minor system the body has.
Just a little common sense here folks. Cover the baby up with clothes if he or she is going to be in the sun for over ten minutes. Create shade. Don't take chances. I nor you want a child with a sunburn, especially at this early age. Adult parents have to act responsibly with children. Something I worry about in the younger adults in this society.
Use vitamin D supplements every day and get your child tested by a pediatrician at age three months and dose accordingly. The formula for dosing is 1,000 iu per 25 lbs or 40 iu per lb. So a ten pound child would get 400 iu, a 15 lb child 600 iu and etc. Find a Doctor that reads because a lot of them do not stay current. There are vitamin D drops available so that might make finding the proper dose a little easier.