Alison meets a four year old with a rare condition

Four year old Henry Tierney has a 'special tummy'. When he was two weeks old he was diagnosed with Prader Willi Syndrome, a condition best known for it's 'uncontrollable hunger'. 

This morning, Henry's parents Emma and Rory were live in studio to chat about all that is involved with Prader Willi Syndrome, life with Henry and what's next as he grows older.

More information on Prader Willi is available on the PSWAI website, and you can follow Emma's own blog