I need some help mamas!

Lo is 11 days old & he sleeps awesome on his stomach (falls asleep every time I lay him on my chest) but I can't bring myself to let him sleep on his stomach when he's in his bassinet. Should I just let him or should I keep him on his back? I have also tried putting him on his side a tiny bit. Not enough for him to roll over but just enough to get him off his back a little bit.