Let your baby sleep on tummy?

Question to anybody. My son will be 9 months, this passed few nights, I noticed he been rolling over to his tummy. He like barring his face into his mattress. I try reposting him but he want go back to his tummy lol. I'm not sure if I should be concern or is he at point where it okay for him to start sleeping on his tummy? He in a sleep sack at night. Just wondering...
Or am I being paranoid about him soffocating himself the way like putting head.  Lol😆 he stubborn 
What about your experience?

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors