I did with my daughter but I live in the Midwest and she was born in Dec...people are notoriously low in Vit D here. Since then, I have found a chiropractor who has been monitoring my levels and will continue to do so during nursing. My levels are currently on the high end of normal, which is necessary if you want to pass appropriate levels into your milk. See if you can find a doc who will be willing to monitor your levels if you don't want to supplement?
If you do decide to just supplement, you can find supplements that are in organic bases and literally you only need a drop or two instead of a full dropper. I'd feel comfortable giving that to a BF baby since it isn much liquid and prob won't mess with the Virgin BF gut.
Me (29) DH (29) DD (12.09) DS (05.12 - my no epi VBAC baby)
CDing, BFing, ERFing, vaxing, retired milk donor Mama.
Dx'd with unicornuate uterus in 02.10.