J.J.
The only bottle that did not give my baby gas was & stillis-she is 16 months- the playtex drop in system. I had the the born free & another high priced supposed colic reducing bottles but finally listened to multiple suggestions to try the playtex drop in system & once I did the results were immediate. I felt so bad that it took me a few weeks to accept it was the bottles I had & to buy what keep being suggested. Good luck