One of the first things Thomas Lobel told his parents was that they were wrong.

The 3-year-old had learned sign language because he had apraxia, a speech impediment that hindered his ability to talk. The toddler pointed to himself and signed, "I am a girl."

"Oh look, he's confused," his parents said. Maybe he mixed up the signs for boy and girl. So they signed back. "No, no. Thomas is a boy."
But the toddler shook his head. "I am a girl," he signed back emphatically.

How do parents handle a child who feels they are living in the wrong body? CNN looks at Gender Identity Disorder.

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