Flat head syndrome

Samantha • Mummy to my beautiful Archie born 13th September 2015 👪💘
My poor little boy has developed a flat head. He will be 3 months on the 13th. In the UK it appears that the doctors aren't interested because it's cosmetic. I don't want my little boy to be bullied at school because of the shape of his head. 
Have you experienced this with your older children and did it really "sort itself out"? What advice is given where you are in the world?
Thank you in advance from a worried first time mummy.