what age did you put ur baby into a room with there brother/sister?

[sambrads]

my DD is 6 months old and sleeping all night. I have 3 DC and a 3 bedroom house so my DD of 6 months will need to share with her sister who is 4.
When is the best time to this? im worried DD will wake her older sister in the night if she cries or the eldest will wake baby if she gets up to the toilet or wakes at half 6 in the morning and wakes her.
my DD who is 4 never leaves her sister alone so that is a concern.
can anyone give me some advice please?

DD1 was 2 and DD2 was 8 weeks when they shared a room it worked fine. They are 4 and 2 now and we have rarely had a problem with them sharing a room

hi noisy did ur DD2 not wake DD through the night?
I think im worried about upsetting the both.

no DD1 will sleep through anything and DD2 slept through the night from about 8 months. There was no other option here because there's 4 of us in a 2 bed flat