I tried both born free and dr. brown's with my kids. Well, I bought Born Free because I followed the advice you should use a nipple that is wider at the base to mimic the breast. However, my daughter wouldn't use them. Upon trying the Dr. Brown's, she was much happier. With my 2nd, we tried the BF again, just to see if he'd use them (as we had a whole set that we'd never used), and he seemed uninterested as well. But with the DB, he ate just fine. I figured out that the DB must more closely mimic my nipple shape. So, that is what I would consider. As far as the flow, definitely start slow, but if your baby is sucking well, but not much seems to be getting in (and maybe then your baby gets frustrated), try the next flow up. Also, BF has a variable flow that adjusts to the baby's suck strength, though I'm not sure it's recommended for young babies.