I have absolutely no doubt that these bottles work for some babies. The 9 other reviews suggest as much and the company would not be in existence if people were not buying their products and more importantly recommending them to others.
But.
We used these on our son. He got the same amount of wind as he used to with Avent (which we found to be better than most others). He gulped as much with these bottles and seemed to suck in as much air (if not more) as with the Avent teats.
I think one of the things as tired and harassed parents is that we look for a quick(ish) fix for our children especially when we see them suffer and theres very little we can do to help them.
Instead of hoping that a bottle with all manner of gadgetry will fix my son's wind problem, I have started to do two or three very simple things, which have helped him. I am happy to share these - so if you wish you can combine them with the use of these bottles:
1. when making up a feed, gently stir the mixture, to avoid mixing in air. I used to shake the bottles which added air. Now that I am stirring them, my son's wind has reduced
2. Check the teats for enlarged holes and its probably wise to change them once a month especially if you feed your child with a bottle at every feed. Larger holes will make the feed come out quicker which will make your child gulp resulting in more air being sucked in, which equals wind!
3. Feed, burp, feed, burp, feed, burp. I used to burp my son after his feed. Now, I usually burp him at least twice during the feed. If he is comfortable, he tends to drink more and tends to therefore finish his feed.
4. Finally, I only have my son's experience of being burped, but I have found a way that makes him burp 100% of the time when he needs it. I put both his arms over my shoulder, so he is (almost) hanging over my shoulder like in a fireman's lift. I then pat his left side for a minute or so. Why? - thats where the stomach is. I then rub his back in a clockwise manner for about 20 seconds or so. Then - and heres where it works 100% of the time, I hold his feet and push them gently upwards. This results in his knees coming up to his tummy. I do this 3 - 4 times. This results in a burp. If on the odd occasion he doesn't burp, I repeat the process.
So.....although I do not rate these bottles, I am sure they clearly work for others. I will stick to Avent, take a little more time in preparing the feed to reduce the air, and make sure I burp my son so he has a restful sleep.