Shannon Penrod, 48, of Saugus, Calif., could feel a change coming over her son Jem Miller. By the time he was two, parts of his speech gradually began to disappear.
In just a few months, what started as, "Mama what are you doing?" turned to "Mama, what doing?" Then he retreated into silence.
"He didn't even acknowledge me in a room or seek me out," said Penrod.
Within six months, Jem was diagnosed with autism, a disorder characterized by withdrawn social and behavioral skills.