How to get my baby to nap in his crib?

Advice definitely wanted, thank you!I have an almost seven month old who will not nap in his crib. He also won't nap in my arms or on top of me. He will only nap in the Tula, against my chest, while I bounce on a yoga ball or walk around, and really I should have a cardigan buttoned around him to make it darker/less distracting. I stay home with him, so I can do this for every nap, but still. It would be awesome if he could nap in his crip.He's been sleeping in his crib since he was four months, and has no problem. He sleeps all night except for one wake up to eat, and even puts himself to sleep at night or if he stirs in the night. We never sleep trained, he just started doing it, which is amazing but it means I don't really know what to do.If I put him in his crib to nap he doesn't really cry, he just doesn't sleep. I can leave him there for an hour and he won't fall asleep, he'll just crawl around and play with his sheet or pull up on the side and look out. If I get him totally to sleep (which is hard, since he's used to putting himself to sleep at night) and then lay him down, he'll sleep about twenty minutes and wake up upset because he's still tired. With him in the Tula, he takes two naps, at least 1.5 hours each.Any ideas? via /r/Parenting http://ift.tt/2qP76u2