We just do the D-Vi-Sol per pediatrician's recommendation. She said EBF babies don't need the extra iron and other vits. We are giving them aimed at the cheek like PP said.
Google Carlson vitamin D drops too. I think those are concentrated so you can just put one little drop on your nipple before BF'ing and that's all baby needs. I've never tried them, but I know a lot of moms on TB use them.