When I had my first child in Dec of 2005, I saw so many different baby bottles that claimed to not keep a lot of air, easy assemble. But after buying a Browns Bottle, I was relieved when my best friend brought me some Vent Air bottles.....never used anything but those until she was finish with bottles all together. Now I will admit cleaning them were kind of annoying, but it was worth it cause other than that the bottles were excellent. —… read full review »