i told my Dr when he asked if we used sunscreen every time the child went outside "NO". but that i didn't supplement w/ Vit D and i did let my babies get sunshine. Not that i held him (it was my first) up to the Sun God for an hour every day at noon, but that i was careful and intentional about sun exposure b/c i believed it has health benefits. he was skeptical at first, but over the years has said that's not frowned upon as much as it once was.
i'm freckled but am blessed that i almost never burn. so i always try to expose my kids in non-peak hours and slowly work them up to summer. we were outside today for an hour, baby was in sunshine for a lot of that, but it was after 3pm. i have 2 fair babies, and 3 darker skinned ones, and i always keep them out of the sun more than I am, but do aim for 10-15 min a day minimum every day from this time of year on. none of my kids have ever had a burn, except one time when their daddy had them at the beach and just didn't notice. he came back BURNED. my fair skinned boy had pink on his shoulders (not enough to peel) and my fair girl had rosy cheeks, and my dark girl was about 3 shades darker than anyone else.... (it was 2 hours and one was peak!) slow exposure is nice b/c they actually slowly get darker and can handle more sun when it's more intense. if we were to have to spend a long time in sunshine, i'd put sunscreen on, but for Vit D (we're up in New England) and for our family's background (hubby is darker northern european, and i'm mixed greek and northern european) it seems we should get some sunshine when we can. by the end of summer all my kids are quite brown, but since quiet time if from 12-3, i know they're not getting a lot of the intense sun.
so a 30 minute iimit for a darker baby sounds good.