These natural Philips Avent Bottles are made from polypropylene, a BPA - free material and the bottles themselves are great quality. (thehomeclone.com)
This also makes Philips Avent bottle warmer dangerous in operation as without automatic switch - off it will continue to work even without a bottle in it. (babygearhub.net)
And unlike many other anti-colic brands, you don't have to buy a whole separate set: These anti-colic nipples are interchangeable with Philips Avent natural nipples, which means this set of bottles is all you'll need. (verywellfamily.com)