S.W.
You don't mention what he is sleeping in now, if he is in a bassinet I would be a bit concerned that he would be too big for it now and could pose a bit of a risk to himself with rolling and pulling up on the sides. But if he is sleeping with you, thats another story altogether. My kids all slept with me, not by choice so much as necessity... they needed to eat and I needed to sleep and it seemed that neither of us were doing enough of either so co-sleeping seemed to work out better for us for the first little while anyway. I moved mine to crib at about 2-3 months depending on the child, some of them were early rollers and I had to get them out of the bassinet earlier because I just didn't trust them in it anymore. They were too wiggly. For my 4th son I bought an apartment sized crib and that was PERFECT, it was small but still a crib with the drop side and everything. I used that from day one with him, (well for naps anyway). He used that crib until he was big enough to climb out of it. It was perfect. They are the same size as a play pen, but an actual crib. It was the best alternative to a big crib for me. I always found full sized cribs to be cavernous when you put a little baby in them. This seemed to make all the difference for us. Good luck and sleep well!