Comfort milk blocking teats?

[kittyxo]

I've been feeding my two week old cow and gate milk, however I noticed he's having a few issues with it and have been slowly switching to their comfort milk, which seems to be suiting him better but after the first oz the teat becomes blocked! I'm using size one tommee tippee bottles and teats.
I've read other people have had this issue with comfort milk as it's thicker but as unsure of the best teat option would be, trying size two, three or variflow? Anyone have any suggestions or experience?

[JiltedJohnsJulie]

I'd just try the next test size OP and see how you get on