My 2nd child, we had him in his own room by 2 days old. This sounds horrible, I'm sure, but after a few children, you get a little tougher. Not to mention, I'm not sure if some of you other mommies have this, but I have SUPER hearing since having children, so I actually, hear them BEFORE they start crying, if you can believe if. What I'm saying is, that them being in MY room, or even close, (I Have a 1.5 year old and a 2 month old), I hear them breathe, moan, etc., and suddenly, I'm up, and and that means, with them, I'can be up ALL night.
So, my new baby has to deal with a little more withdrawel from mommy than the other, but, you know kids have always dealt with stuff.