"I'm not transgender. I. Am. A. Boy," says 5-year-old Tyler, who born a girl. He first insisted he was a boy at the age of 2, and eventually was diagnosed with gender identity disorder.
Now, his parents allow him to present himself as a boy, and Tyler's mom doesn't think he's going through a phase (though doctors say many children with gender identity disorder eventually switch back to their biological gender). "I just want my child to be happy," she says.