Can I let my baby sleep like this?

Summer

My baby refuses to sleep on his back. Hes 7 weeks old and has slept on his tummy since the day we left the hospital otherwise he cries and cries and cries non stop.. He hates being swaddled, and wakes himself up on his back. Some times i can get him to fall asleep briefly on his back but only if in holding his feet. The moment i move he wakes up and cries.

I cant think of any reasons this could be dangerous?? It seems to be comforting him. The pillow is just kinda pushing his legs up a bit and curves around to his sides.

Opinions?