MAM Bottles - Advise Pls

[Boop]

Hello,
I have been using MAM bottles, which are the only ones my DD will use, which is fine.
I seem to having problems with them leaking, I have changed teats, and make sure all done up tight, but seem to leak from the top ring (by the teat) I make sure all is pulled through and no gaps..... driving us mad, and at night when DD ends up soaked and not had enough milk!
Any ideas ? Thanks Boop x

although the teat is pulled up, turn over the rim with the teat in and run your finger around the flat bit of the teat and make sure it's in the rim.
We had the same when we used these bottle and found it was just that, they looked pulled through, but weren't snug against the rim on the underside.
HTH