My baby is going on 10 months, lately he started crawling and climbing up, which has caused problems with night time and nap times because he likes to climb up. So I got a halo sleepsack ( the one with the arms out) but now he's starting to sleep on his stomach. Every time he wakes up I put him back on his back. But he ends up going back on his stomach and I keep checking on him more than I use to. Is this too dangerous? Should I be concerned about SIDS? Or is this what is comfortable to him? I need help and advice!