L.I.
What I would do is for now, have the baby in his/her own room. Your other 2 are probably used to sharing a room and with a new baby in the house it will be enough change for them and if you seperate them it will probably be hard for the one that is alone to understand. Also the baby is going to have different nap/bedtimes and it will just be easier for you if the other 2 kids want you to read them a book ect. That is what I would do--good luck on your decision and best wishes with your soon to be here bundle of joy!!