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A 19-year-old woman gave birth to twins with two different fathers after having sex with both men on the same day.
The mother, who has stated that she would prefer not to be identified, is from the small Portuguese town of Mineiros in the state of Goias.
A DNA test was taken by the man that she believed to be both of the boys' biological dad when they were eight months old.
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But the result came back as positive for only one of her sons and the woman revealed: "I remembered that I had had sex with another man and called him to take the test, which was positive.
"I was surprised by the results. I didn't know this could happen and the babies are very similar."
The birth certificate still registers just one man as the father of both children, with the mother.
She added: "He takes care of both of them, helps me a lot and gives them all the necessary support that they need."
Dr Tulio Jorge Franco has been studying the manner of the unusual pregnancy, which is understood to be only the 20th known case of heteroparental superfecundation to use its scientific term.
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The doctor explained to Portuguese news outlet G1 that such a pregnancy happens when "two eggs from the same mother are fertilised by different men.The babies share the mother's genetic material, but they grow in different placentas".
He added: "The pregnancy was super smooth, without any complications. The boys were born healthy and have never had health problems.
"It's extremely rare. It happens once in a million. I never imagined that I would see such a case in my life."
The doctor made the decision to disclose the story this week with the twin babies now one year and four months old.
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