Babies born apparently female in a tiny village in the Dominican Republic are turning into men at puberty due to a genetic deformity.
Around two per cent - or one in 90 - babies from Salinas are thought to be born with the condition, which occurs due to a missing enzyme during pregnancy.
The transition is so common the children are referred to as Guevedoces, or 'penis at 12 years'.
Babies born apparently female in Salinas, Dominican Republic, are turning into men at puberty due to a genetic deformity. Above, Catherine and his cousin Carla, who is currently undergoing the transition
Johnny is one of the babies affected and was initially brought up as a girl named Felicity by his parents.
The 24-year-old said doctors didn't originally know what sex he was but he always felt more like a boy, according to the BBC.
He said: '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 - when I saw a group of boys I would stop to play ball with them.'
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Another boy, named Carla, said he is also going through the same transition aged nine after appearing to be born a girl.
Pictures show Carla, who will change his name to Carlos, wearing a pink patterned top with his hair in bunches as he smiles alongside his cousin Catherine.
The condition was first discovered in the 1970s after a scientist from Cornell visited the island.
Babies usually form male sex organs after around eight weeks in the womb, with the change triggered by hormone dihydro-testosterone.
Around two per cent - or one in 90 - babies from Salinas, marked above on the map, are thought to be born with the condition, which occurs due to a missing enzyme during pregnancy
But a handful of babies do not have the enzyme that triggers the hormone surge and consequently appear to be born female.
They will not form male genitalia until they reach puberty, when there is another surge of testosterone.
Some experts have suggested there is such a high concentration of children affected in Salinas due to the village's isolation.
The extraordinary condition will be explored by Dr Michael Mosley on BBC Two's Countdown to Life - The Extraordinary Making of You tomorrow night.
According to the BBC's website, the programme 'explores how this remarkable human diversity is so crucial to our species, but [also shows] that these complex processes can occasionally go wrong'.
Countdown to Life - The Extraordinary Making Of You is on tomorrow at 9pm on BBC Two
Read more: http://www.dailymail.co.uk/
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