Teenager gives birth to twins from two fathers after having sex with them on same day

It happens one in a million.

A 19-year-old woman gave birth to twins with two different fathers after having sex with both men on the same day. It is believed to be only the 20th case or 'heteroparental superfecundation' ever to be recorded in the world after both men produced positive DNA tests for the different babies. The woman, who wished not to be named, is from the town of Mineiros in Portugal, and welcomed her two boys into the world recently. She was shocked when DNA tests from the man she presumed to be their father came back as positive, but only for one of the children. She explained to local media that she had previously had sex with two men on the same day saying, "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," she added. "I didn't know this could happen and the babies are very similar."

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. It is thought to be the 20th case of this kind to ever be recorded in the world. Dr Franco, explaining further insight into the case, told G1: "It is possible to happen when two eggs from the same mother are fertilized by different men. "The babies share the mother's genetic material, but they grow in different placentas. "It's extremely rare. It happens one in a million. I never imagined that I would see a case like this in my life." But despite the fact the babies have different fathers, it's understood that only one of the men will be registered on the birth certificate. The young mum added: "He takes care of both of them, helps me a lot and gives them all the necessary support that they need."