So far, my 3 month old has been using it successfully, though how he can sleel on the thin cardboard is beyond me. The changer has been sturdy as well. And the side pockets are really handy.
But once you convert it to a playpen, the bottom surface is lousy. Completely unstable. I had my 3 month sleep in the playpen while travelling (didn't take the bassinet attachment), and has to take him out to sleep in the bed with me. The thin mattress had no solid surface to rest on so became lopsided. I bought this product hoping he would play in it until age 2, but now I'm not so sure.