Do what you want/need to do! The kids will adjust! We started with our son in our rooms closet after he was born and our daughter in her room (the only other room in the house) they are two years apart in age. Then at about 6 months we moved our son into her room because we just couldn't stand being able to hear ever noise he made. They did great had no real bad problems adjusting (we had to find a way to keep her out of his crib that was the hardest adjustment)and our daughter slept through most of his middle of the night wake up calls. They are now 3/5 and 1/5 and are in twin bunk beds and do great! We have actually found that they both sleep better together then they ever did apart from each other. Best of luck!