Blandford boy 'only one' with genetic disorder
25 September 2013 Last updated at 23:48 BST
A two-year-old boy from Dorset is thought to be the only person in the world diagnosed with a rare genetic disorder.
Lewis Preuss, from Blandford, was inexplicably born missing part of chromosome number eight.
As a result he suffers from a range of medical and developmental problems.
Every day is a learning curve for his parents, who are hoping to raise awareness of such conditions.
South Today's Jo Kent has been to meet the family.