Thanks girls. Naomi, that 600-800ml per day thing is good to know! I think we are ok then. When I am not with her she doesn't really drink much formula: she'd probably only have 300ml total. So that means 3 100ml feeds overnight would still be fine (not that I'm happy to be waking 3 times a night, LOL! But if I HAVE to, it will be ok).
I am trying to get Phoebe onto 3 good meals per day and get a bit more structure to her day, but today it was just impossible. We were on the go all day. I had to get a new windscreen on the car this morning (biiiiiiig stone chip and it had started to crack), so we hung out at the big shops down the road for 2 hours while they did it. Phoebe slept in the stroller but only for 40 minutes. Then we went home for lunch but had to go out again for our fortnightly shopping, so she slept in the carrier, again for only 40 minutes. Then she was sooooo cranky at dinner time she hardly ate anything, then fell asleep on the boob at 6:30. She's awake now, I have fed her some yoghurt and will give her another milk feed (if she'll take the boob, great) before bed. Then only water between 12 and 5. (Though if she's really upset I just don't know if I'll be able to get away with it. I'm not going to let her cry, so if she has another bottle, so be it.)