I use to put ds in his crib for the first part of the night. I gave up on this when he was about 5 months old, he is now 7. He sleeps great in my bed with me and we both get rest now but he will be crawling soon and I dont want him wandering. I dont have the bars on the side of my bed and was wondering if this made anyone else nervous and what others have done to keep things safe. I would prefer he slept in his own crib and also wonder if I have made a mistake, if he will ever sleep alone now. Anyway, back to the original question, should I place my mattress on the floor? I dont want to put the bars on the sides of my bed if I can avoid it. Any suggestions on what is/is not safe with co sleeping as they reach milestones?