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Tammy McDaid is raising money to secure experimental treatment for her son, Tate, who has a rare and devastating genetic disorder

Sanfilippo Syndrome, often called childhood dementia, causes developmental regression and premature death

“My little boy has never spoken a word,” McDaid said, “and now I know I will never get to hear his voice"

A U.K. mom is racing against the clock to get her son, 4, accepted in a clinical trial to fight his rare, degenerative form of childhood dementia.

“The next year is quite critical in Tate's life as it's around now that things start to show,” Tammy McDaid told the BBC about her son, Tate. He was initially diagnosed with autism at age 2, but as his mom, who hails from Swansea, Wales, said, "Deep down I always suspected there was somet

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