Boy always pees through during the night

I have a problem with my 6 month old boy. He pees through EVERY night. It’s because he sleeps on his belly so the diaper is full in the front and dry on the back.

He will not sleep on his back. Despite me turning him over. I’ve tried a size up and I’ve tried every brand of diapers.

His penis is always pointing down. Last night I changed him twice in the middle of the night yet still peed through. His diaper was completely dry in the back.

We have tried overnight diapers.