i put my daughter on her stomach till she falls asleep then when i see that shes knocked out i turn her over , but you do what you feel is best for him
my sons the same way. he will be 3 weeks on Sunday. and he won't sleep on his back he fusses and whines tell I out him on his side.
peooe will say lots of things but do what you feels right mama.
I put my son inw his side he sleeps in bed with me, he even gets covered with the same comforter I use.