I have used these bottles now for five months and they are great. I know they are expensive, but if you are having issues with your baby and gas, they are a life saver. I used two previous kinds of bottles and as soon as I switched to these, no more changes for baby.

The only pain is that you have various parts to pull apart when washing and sanitizing, but if you buy one of those containers that fit all the parts, and toss them all in the dishwather, you are all good.