Baby sleeping on stomach?

My 3 month old is down right now napping on her tummy after she rolled over. I’m so nervous!

Only way our son sleeps 😑 we just made sure that he can turn his head and he likes to scoot to the top of the cradle. My ped said that if that's the way they sleep then it is what it is. Sleep is important for them and he has colic and reflux so sleeping on his stomach is more comfortable for him. It also helps with my sanity because he doesn't wake up every 30 minutes

Age?