Paternity Test: Twins conceived naturally can have two biological fathers, says Experts

Medical experts say that it is possible for twins conceived naturally to have two different biological fathers.

The phenomenon, they say, is known as heteropaternalsuperfecundation — a phenomenon that occurs when two different males father fraternal twins.

They experts say that in general, superfecundationis rare among humans but it is common in animals.

The phenomenon is also referred to as double paternity, even experts warn that the incidence may be substantially higher in small selected groups of dizygotic twin maternities, such as those of women engaged in prostitution.

Researchers describe superfecundation as the fertilisation of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two different fathers.

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According to experts at the European commercial social networking site for scientists and researchers, ResearchGate, superfecundation is an extremely rare phenomenon.

“It occurs when the second ovum (released in the same menstrual cycle) is fertilised by sperm cells from separate sexual intercourse.

“Superfecundation can occur only when a woman has had sexual acts within a short period of time from one another,” the experts assert.

Again, experts at online platform, The Conversation, state that, for heteropaternal superfecundation to occur, the mother’s body must release two eggs during ovulation that are then fertilised by two sperm cells from two different men.

Speaking in an interview with PUNCH HealthWise, Consultant Obstetrician and Gynecologist, Dr. Oluseyi Adelekan, said superfecundation occurs when a woman releases more than one egg during a cycle, such that if the woman has sex with two different men within the cycle, she can get pregnant for each of them.

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“So let’s say, she releases an egg today and another 24-72 hours later, and she has sex on those different occasions and the eggs get fertilised by different sperms,” he said.

Explaining further, Adelekan said, “Some women can ovulate more than once within a cycle, at intervals of few hours to few days.

“And these eggs released at different times can be fertilised by different acts of sexual intercourse, either by the same man or a different man.”

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Adelekan, who is also a fertility expert, said though the condition is rare in humans, it has occurred in few instances.

“There was a white woman who had sex with her husband and was raped a few days apart by a black man. She got pregnant and delivered twins — one white and the other black,” he said.

Continuing, Adelekan noted, “It is common in animals and it has been found to occur a few times in women. It has occurred following an IVF.

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