Last I checked there's only two genders with an occasional error but it's very rare; consistent facts don't seem to be available but it seems about 1 in approx 2000 births are "those types".
I know a teacher - she’s 35 and teaches high school. She tried to tell me that 1 in 10 children is actually born with both sets of genitalia. Nobody realizes this because the doctors quickly take the baby at birth, do whatever they have to do to make it either one sex or the other, then return it to the mother without saying a word.
I stared at her in stunned disbelief. All I could say is, “This is what the ministry is telling you people? And you actually believe this?” She believed it. That’s who is teaching today.