Playtex Ventaire Baby Bottles Review

I was told by experienced mothers about this bottle being better for gas and extra air in the tummy but i don't see any difference. I like the bottle because of the grip. My son loved the size one nipple but now its getting too slow for him so i got the next size up (2) but that is way too fast for him. Also there are so many different parts and there is a small plastic part that sometimes comes loose or does not sit properly with the bottom piece of the bottle and the formula will spill out all over the place. I mainly like the shape of it tilting so you dont have to strain the childs neck or put the head too far back to give them the last of the milk in the bottle.