Just wanted to post to share what I've found to be the ONLY bottle my 4 month dd will take. I recently went back to work and we've had the WORST time getting her to take a bottle (she screamed with every bottle, sippy cup, eye dropper....). We looked online and found BREASTFLOW bottles. She took the first bottle no problem, and has been taking them ever since (knock on wood!). We bought them online, but recently found them also at toys r us.
hope it helps!