Around 750 babies in the UK are born with Down's syndrome every year, but it's still unusual to see someone with the condition on TV or in adverts.
One person who'd like to see this change is Ruben.
Ruben is 13 years old, swims for Great Britain, loves to DJ for his mates and also has Down's syndrome.
The genetic condition means he has learning difficulties and looks a bit different to some of his friends.
In his first of two reports he meets Seb, a boy with Down's syndrome who has modelled clothes for Marks and Spencer.