5 month old has flat head

[Tasha2106]

I’ve attached 2 pictures one of the top of my babies head and one front on. We have noticed his head has gone flat. He sleeps at night on his back with a flat head preventing pillow naps on his side during the day and props up with cushions and uses a jumperoo so no pressure on his head. I have an appointment for injections tomorrow is there anything a GP will do about it? Any one got any experience with this?

My son had a completely flat head at the back from laying out n his back literally looked like a D with the flat line being the back of his head and the curve being his face.
Once he was mobile and could sit, crawl, walk it 'popped' back to normal over the course of about 6 months.
Some people suggested cranial osteopathic treatments but I just let nature take its course.
He is now 12 and you would never know