We tried cosleeping with my firstborn and while my husband would sleep just fine, Dorian and I would lay there staring at each other and not sleeping! In the end, he would only come into bed early in the morning when it was cold. He slept in a travel playpen until my second was born, when he was just over a year old. We wrestled with the idea of moving him into a big bed, but in the end, he just moved over and that was that. He was fine and the new baby got the playpen/crib.