Guevedoces: Children thought to be female turn into boys at puberty due to rare genetic disorder


Catherine and his cousin Carla, Guevedoces in the Dominican Republic

Girls in a remote Caribbean village are becoming boys when they hit puberty due to a rare genetic disorder.

One-in-90 children born in Salinas in the Dominican Republic grow a penis in a natural transformation from female to male.

Known as the guevedoces, which translates to "penis at 12", these youngsters are referred to in medical terms as "pseudohermaphrodite".

It is so common to be a pseudohermaphrodite in Salinas, that it is accepted as a third sex, alongside male and female.


Johnny, once known as Felicita, said he was born as a girl but developed into a boy aged seven

As a child, he did not have a penis and was brought up as a girl.

He said: "I remember I used to wear a little red dress. I was born at home instead of in a hospital. They didn't know what sex I was.

"I went to school and I used to wear my skirt. I never liked to dress as a girl. When they bought me girls toys I never bothered playing with them. All I wanted to do was play with the boys."

The rare genetic disorder is caused by a missing enzyme which prevents the production of the male sex hormone dihydro-testosterone in the womb. It creates what looks like a baby girl on birth.

But at puberty, when testosterone flows, their voices break and they grow a male sexual reproductive organ that they become recognised as male.

BBC presenter Dr Michael Mosley said: "Guevedoces are also sometimes called 'machihembras' meaning 'first a woman, then a man.'

"When they're born they look like girls with no testes and what appears to be a vagina.

"It is only when they near puberty that the penis grows and testicles descend."

The guevedoces were first studied by Cornell University endocrinologist Dr Julianne Imperato in the 1970s.

She travelled to the region to learn more about rumours that girls were morphing into boys.

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