I'm an American but I can still be helpful, LOL! Go to this website and it will give you all the info your are looking for, straight from the company's website. Hope this helps!
[url]http://www.consumer.philips.com/consumer/en/us/consumer/cc/_categoryid_MCC_NIPPLES_SU_US_CONSUMER/#/consumer/en/us/consumer/cc/_categoryid_MCC_NIPPLES_SU_US_CONSUMER/[/url]
BTW, I use Avent Naturally and my daughter was bouncing back and forth between the size 2 and 3 at 6 months. Now, when she will take a bottle she only takes gthe size 3 - fast flow. (SHe is in a phase right now where she wants to drink out of a regular cup. No sippy, no nipple/teat, just a cup!)
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