Lloyd Tayloe Griffith (he gives his age as "seasoned"), a physician from Mount Holly, Va.

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"That's the group we struggle with most, " says Dr. Tayloe, who is currently seeing a 37-year old patient with Down syndrome.

WSJ: Young Adults Find It's Hard to Part With the Pediatrician

Still, defense co-attorney Shari Tayloe Young says the genetic evidence was critical.

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"We've gotten pretty good about saying, 'Your mamma should know about this, and when you're ready, I'll go talk to her about it with you, ' " says Dr. Tayloe.

WSJ: Young Adults Find It's Hard to Part With the Pediatrician