Flat head RHS

El :) pregnant with my 2nd bump❤

Hi everyone, I'm just looking for advice or recommendations! My son loves to sleep with his head to the right. He is 10weeks old on sunday and we noticed the effect it was having on his head at about 6 weeks. Since then we have been to the doctors, and an Osteopath who has given us exercises to do. We are trying our best but when we lay him down for a nap he is really unhappy if we put his head to the left and so we wait till he is asleep to do it but he will eventually turn it back! I burp and feed him on the opposite side now and do tummy time, but im worried about it getting worse. Any pillow recommendations? anyone else have this problem and it get better? I've included a pic of my boy for attention! :)