NOT Identified by genitalia at birth!! Gender is identified by DNA at birth! There are genetic anomalies, but those are rare. And there is still an identifiable gender with most of the genetic anomalies. PERIOD.
NOT at birth. At CONCEPTION.
Zing em again!
How about a DNA test for gender? Useful for forensics, appropriate healthcare, and might be the necessary evidence to help someone confused about their feelings.
Best Affirmation. (Make that the brand name at CVS.)