The infants, now two-year-old, were sent for DNA tests after their parents grew suspicious of their different looks where one started growing thick wavy hair while the other had thin, straight hair. Twins were found to have different fathers after being DNA tested.
The parents, from Hoa Binh province in Vietnam, had initially been concerned that they had been given the wrong baby in the hospital. But the tests by the Ha Noi Centre for Genetic Analysis and Technology proved the twins shared the same mother but had different fathers.
The mother’s 34-year-old husband was the father to one of the twins but the second twin was not – making them bi-paternal.
This is the first reported case of bi-paternal twins, which are extremely rare, in Vietnam.
A woman’s egg has a life-span of between 12 and 48 hours, he said, while a sperm can last for between seven and 10 days. It is during this overlap that it is possible for two eggs to be fertilized.
Dr Keith Eddleman, director of obstetrics at Mount Sinai Hospital in New York told CNN that it is possible for a woman to conceive bipaternal twins through two acts of sexual intercourse.
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