I picked Gerber brand bottles for my daughter whom is formula feed before she was even born. I chose them for the sole purpose that they fit on top of these perfectly:
These are single serving glass bottles that worked well for our hospital stay and the first few days at home. 
This is the size of the first nipple that L Bean used. She was fine with it. It wasn't too small or too big, and this is the first thing she had in her mouth, obviously seeming normal to her.
This above nipple came in the second pack of bottles that I bought. I didn't notice that it was a bit smaller then the first one...(who measures nipples?) L Bean seemed fine with it.
This is the nipple size that came with the third pack of bottles that I bought. When I went to wash these I saw a noticeable size difference. What is this nipple for? An ant? Seriously it is so tiny. Needless to say L Bean thinks size does matter when it comes to her and her nipple!
