Four year old Seb White has chubby rosy cheeks, bright soft blue eyes and a mischievous smile. He will be the Marks and Spencer’s campaign model for their Christmas kid’s collection; coincidentally he also has Down’s syndrome.

Caroline White, Seb’s mother, grew tired of being bombarded with images of happy smiling families and children in advertising campaigns which did not represent children and people like her beautiful young son. She said: ‘When Seb was born, I vividly remembe...