We moved to the bigger bottles when LO was regularly emptying her 125ml bottles and asking for more! This was probably at about 10 wks old? She's never been a huge eater.
As for the teats, I changed her to the stage 2 ones when she seemed frustrated with the newborn ones, probably at about 12 wks old. She used to choke awfully though on newborn teats when she was really tiny. I recently tried her on the 3 hole teats but they're much harder than her current ones so she's refused. She just chews on it! I'll stick to what she likes
I have been using the 9oz bottles since my LO was about 2 weeks old, purely because i always make up 1oz more than she drinks. I am planning on trying her on the 1month teats from today as she has started being fussy with the last couple of oz in her bottles x
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