How common is it?

   It seems like Trisomy 17 may be more common than I first reported. Apparently there are different forms of the disorder. I think that numbers I cited before (7-50 known cases) was probably for specific forms of the disease. My friend pointed me to a Wikipedia page that says that one specific form, Potocki-Lupski syndrome affects 1 in 20,000. Still a pretty rare disease, but not nearly as rare as what I first reported.

Joey at 2 days old.