Prader-Willi syndrome is a rare genetic disorder that affects development and growth. Peter Mitchell and Jane Bunn spoke with Cooper who lives with the syndrome, his dad, former Carlton great David Rhys-Jones and Tom Connell, Chief Medical Officer at the Royal Children's Hospital. Donate: 1300 277 325 or www.goodfridayappeal.com.au | 7NEWS Melbourne

4.1M views · 43K reactions | Olivia is diagnosed with Prader-Willi syndrome and is missing part of her 15th chromosome. This results in many symptoms, such as an appetite that can never be satisfied. It is not just Olivia's genes that are rare, but also her enormous imagination. | Special Books by Special Kids | Facebook