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Can a baby have two biological fathers?

Superfecundation is the fertilization 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 separate biological fathers. The term superfecundation is derived from fecund, meaning the ability to produce offspring.

en.wikipedia.org - Superfecundation - Wikipedia
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Superfecundation is the fertilization 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 separate biological fathers.[1][2] The term superfecundation is derived from fecund, meaning the ability to produce offspring. Homopaternal superfecundation is fertilization of two separate ova from the same father, leading to fraternal twins,[3] while heteropaternal superfecundation is a form of atypical twinning where, genetically, the twins are half siblings – sharing the same mother, but with different fathers.

Conception [ edit ]

Sperm cells can live inside a female's body for up to five days, and once ovulation occurs, the egg remains viable for 12–48 hours before it begins to disintegrate.[4] Superfecundation most commonly happens within hours or days of the first instance of fertilization with ova released during the same cycle. Ovulation is normally suspended during pregnancy to prevent further ova becoming fertilized and to help increase the chances of a full-term pregnancy. However, if an ovum is atypically released after the female was already impregnated when previously ovulating, a chance of a second pregnancy occurs, albeit at a different stage of development. This is known as superfetation.[5]

Heteropaternal superfecundation [ edit ]

Heteropaternal superfecundation is common in animals such as cats and dogs. Stray dogs can produce litters in which every puppy has a different sire. Though rare in humans, cases have been documented. In one study on humans, the frequency was 2.4% among dizygotic twins whose parents had been involved in paternity suits.[6]

Cases in Greek mythology [ edit ]

Greek mythology holds many cases of superfecundation:

Selected cases involving superfecundation [ edit ]

In 1982, twins who were born with two different skin colors were discovered to be conceived as a result of heteropaternal superfecundation.[7][5] In 1995, a young woman gave birth to diamniotic monochorionic twins, who were originally assumed to be monozygotic twins until a paternity suit led to a DNA test. This led to the discovery that the twins had different fathers.[3] In 2001, a case of spontaneous monopaternal superfecundation was reported after a woman undergoing IVF treatments gave birth to quintuplets after only two embryos were implanted. Genetic testing supported that the twinning was not a result of the embryos splitting, and that all five boys shared the same father.[5][8] In 2015, a judge in New Jersey ruled that a man should only pay child support for one of two twins, as the mother had sex with two different men within a week.[9] In 2016, an IVF-implanted surrogate mother gave birth to two children: one genetically unrelated child from an implanted embryo, and a biological child from her own egg and her husband's sperm.[10] In 2019, a Chinese woman was reported to have two babies from different fathers, one of whom was her husband and the other was a man having a secret affair with her during the same time.[11] In 2022, a 19-year-old Brazilian from Mineiros gave birth to a twin from two different fathers with whom she had sex on the same day.[12]

See also [ edit ]

References [ edit ]

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Why is everyone having twins right now?

A big reason for all those twins is an increase in medically assisted reproduction, including in vitro fertilization, ovarian stimulation and artificial insemination. Another reason is that women in many countries are having babies at older ages.

webmd.com - Couples Everywhere Are Having More Twins - WebMD

By Robert Preidt

HealthDay Reporter

FRIDAY, March 12, 2021 (HealthDay News) -- Yes, you really are seeing double -- more twins are being born now than ever before.

There are a number of reasons why, according to a new study.

Since the 1980s, twin births rose by a third worldwide -- from 9 to 12 per 1,000 deliveries. About 1.6 million twins are born each year and one in every 42 babies is a twin. A big reason for all those twins is an increase in medically assisted reproduction, including in vitro fertilization, ovarian stimulation and artificial insemination. Another reason is that women in many countries are having babies at older ages. The chances of having twins increases with age, according to the study published March 12 in the journal Human Reproduction. "The absolute number of twin deliveries has increased everywhere except in South America," said study author Christiaan Monden, a professor of sociology and demography at the University of Oxford in England. "In North America and Africa, the numbers have increased by more than 80%, and in Africa this increase is almost entirely caused by population growth."

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