Need help with newborn sleeping!?

My son is nine months old now, but he did the same thing. When he would be tired I would put him down for a nap and lay him in his bouncy seat. I would then nap on the couch with him beside me, with my hand on his chest or holding his hand. I always figured it was from where I was so tiny before I got pregnant and there obviously not much room for him to move around, so he got used to being so close and cramped. I just figured he still wanted the closeness.