Inconsistent bottle feeding

[vet272]

10 week old taking feeds on demand. This can range from 2 1/2 hrs to 4 hrs. She takes from 3 to 5 1/2 ozs.
Can't get into any kind of routinise and nights are exhausting.
She also only poops every 3rd day, although gp said this is fine. I'm not so sure...
Thoughts?

That's normal. The way to cope is to go to bed earlier. If you are in bed from 7pm until 8pm then in 13 hours somewhere you get our 8 right?

It doesn't last forever.

I have 5 birth children. All were breast fed. Early nights and late mornings are not an option

Meant to add this is a foster baby but don't know how to edit my original post

Not sure why early nights aren't an option. I have a big family too with the children close in age. Things have to get left and put on hold for sure but the only thing that would make it a bit more difficult perhaps is if you were a single parent. Are you?

I would expect having older children makes it easier to get more sleep as presumably having that many means by now some of them can feed themselves/each other, find stuff etc.?