Baby flat head HELP

My 6 week old back of his head is flat! How can I hold him to avoid putting more pressure on there? Any other position or is that just unavoidable?!

When I hold him to feed him (bottle) I can just feel the back of his head pressing against my arm and it’s stresses me out thinking he’s putting more pressure on the spot and making it flatter😭😭😭

It is fairly evident and can see the soft spot. I am trying to keep him off it but HOW?! It’s so hard when he’s supposed to sleep on his back! Or can I make him sleep on his sides?

I’m really worried about it ! FTM