On a more serious note:
I think the people that UK-Engineer is talking about should be classified as "intersexed" rather than (transgendered)
Yes an (Intersexed) person is born that way which is a quite rare condition.
The Rest of the transgendered people ideally should have all the physical anatomy of one gender (either fully developed male or female gentiles) and the mindset of the opposite gender.

A good example for the later is “ Lady Gaga” O_o!