Please help with sleeping arrangements!!

[Mintymoomoo]

Currently have 3 girls, oldest 10 has own room and 8 & 6 year old share the big room!

I'm 10 weeks pregnant with dc4 and was first thinking I would put oldest girls who will then be 11/9 in big room and the youngest who will be then be 7 in the small room with cot in for baby to go into once it's sleeping through and to big for Moses basket!

But now I'm worrying this won't work! Will a baby and a 7 year old be ok to share? Thinking about when baby is down for afternoon nap wtc DC will not be able to play in her own room etc and worried about the baby waking her in morning as DC loves her sleep and is always the last up!

Have thought about all 3 girls sharing but just can't see that as a option, can barley fit 2 and all there rubbish in one room

How do you fit your children all in

I really don't think it's particularly fair to put a very young baby in with an older sibling tbh. Even "If" they're sleeping through most nights there'll still be times they wake crying and it'll disturb your older child. I've kept all mine in my room until they were over a year old and kept the disruption to the older ones to a minimum.
In your position I'd definitely keep baby in with you for a while.