 Hi, I'm Clint Black. Have you heard of Rett Syndrome? I hadn't until my niece Courtney was diagnosed. Rett Syndrome is a neurological disorder which occurs mostly in girls. It's often misdiagnosed as autism or cerebral palsy. Rett Syndrome strikes without warning. A girl with Rett Syndrome starts out as a happy, healthy baby until 6 or 18 months of age when something goes terribly wrong. She loses the ability to speak, use her hands to play with toys or even feed herself.