We used them with DS for the first 3 months. I swear they helped him latch on me better. Plus he never experienced nipple confusion. We started him on this type of bottle at week 2. We've switched to a BPA free bottle now since he is old enough and past the possible confusion stage.
I tried these with my son at 6 weeks. He did okay with them but seemed to take a very long time to eat and was spitting out half of what he ate. I ended up changing to an advent bottle. I was really excited about the breast flow bottles but they didn't end up working for us. I hope you have better luck with them!!
Re: anyone use "Breastflow" bottles/nipples?