As reported by the BBC: http://www.bbc.co.uk/news/world-europe-24767225
About time the world recognised this problem.
Poor old Yahweh, suffering from Alzheimer's Disease, when he told a scribe that he had created humans as 'Male and Female,' had already forgotten about the 'in-betweens' that resulted from his system of making humans male and female.
The problem is, contrary to the way Yahweh portrayed it, (that males were first), all new conceptions start life in a default mode that, if uninterrupted, would mean that they would be born female. Every foetus has a pair of Mullerian ducts that contain female organs (fallopian tubes, cervix, and upper section of the vagina) and also wolffian ducts (includes, the testis, the epididymis, vas deferens, seminal vesicle, and ejaculatory duct). Without interruption, the wolffian ducts would not develop and the resultant child would be female. If you accept Christian theology, Yahweh's method of producing males was to insert a Y chromosone into the human genome (the entirety of an organism's hereditary information). It operates by 'kicking in' at a certain point in the pregnancy, producing hormones that inhibit the development of the Mullerian duct and allowing the development of the Wolffian duct, resulting in a male child. The hormonal chemicals, in a process called 'masculinisation,' also affect the brain.
It does not take a great step of the imagination to realise that variations in the operation of the Y chromosone can result in corresponding variations in the genitals of a child, who could have characteristics of both male and female sexes. It is thought that imperfect or partial sexualisation of the brain can result in the situation where a child believes that they have the wrong biological body (and, wants a sex change).
Old Yahweh, (or, his offsider, the now more popular, Jesus), were always sloppy workers. Sadly, the inablity of their followers to work all this out has meant many tragic situations for thos born with unclear sex organs, or worse an incompletely sexualised brain.