We originally purchased much more expensive bottles for my son, now four months old.  After about two months he was screaming through his bottles.  Out of sheer desperation I used one of the Gerber bottles that we had in the diaper bag for emergency purposes.  He loved it and still does.  He has pretty bad acid reflux and these bottles are the best.   Other bottles have better marketing, that I did fall for, but these are the best bottles ever.  We used a different expensive brand for my older son and I wish we would have just gone with these from the very beginning with both of them. ...