I wish you luck! I'm sure it will be trial and error for you. For me it really depends on the child. In general, by 2 1/2 mine are ready to be all together on cots in the same room. That said, I currently have one that I cannot trust to stay on his cot or be quiet...and those (along with the littles) I isolate to their own individual rooms (in playpens). (Love love my video monitor with 4 camera option).