[fourseventy]

A female or male is not 'assigned' anything. Just because you are confused about biological reality doesn't mean it doesn't exist.

[thrance]

Just because you are confused about the distinction between gender and sex doesn't mean it doesn't exist.

[frumplestlatz]

Birth certificates record sex, not gender, no?

[bit-anarchist]

Theoretically, yes. But, sometimes, they do get it wrong.