Teat size - does it matter??

[MiaMamma]

I'm confused here, need some advise..
DD is nearly 10m, bottlefed since 6m and always been on size 2 teat. Now one of my friend said that older babies should be on size 4 (didn't even know size 4 excisted!). But DD is fine with number 2. Should I try the bigger one or stay with the one I use? TIA!

Er....your baby is happy, you are happy....what's it got to do with a friend who says what babies 'should' be on???

Isn't the only 'should' here to do with what is effective and comfortable?

Oh, I know... I don't know why I even listen other's opinions... It's just she has an idea that all 9m old babies NEED to be no4 teats and she's trying to put her DD to no4 as well. Maybe I just have this in my head and should tell her not to push her DD. Decided not to do it with my DD anyway..