An Australian woman has given birth to twins with entirely different biological parents after she conceived her own child naturally around the same time she was carrying an embryo for another couple.
The highly unusual case occurred in Queensland, where the 27-year-old woman had agreed to act as an altruistic surrogate for a couple unable to carry a pregnancy. An embryo belonging to the intended parents was transferred to the surrogate in April 2025.
Around the same period, however, the surrogate also conceived naturally with her husband.
An ultrasound about two weeks after the embryo transfer revealed she was carrying two babies. Subsequent genetic testing established that the girl was the biological child of the intended parents, while the boy was the biological child of the surrogate and her husband.
Both babies were delivered in November 2025. Each couple has since been raising its own biological child, with no dispute between the families over parentage.
The extraordinary circumstances nevertheless created a legal complication because Queensland’s surrogacy laws generally prevent “birth siblings” from a multiple birth being separated through different parentage orders.
The matter went before the Children’s Court of Queensland, where Judge Jodie Wooldridge ruled that the boy and girl were “gestational twins” but, given the unique circumstances, were not “birth siblings” for the purposes of the surrogacy legislation. The ruling allowed the parentage arrangements to be formally recognised.
An independent counsellor also advised the court that raising the babies separately was unlikely by itself to cause psychological harm, provided they grew up in stable and supportive families.
Both families have indicated that the children will grow up knowing each other and will be given an age-appropriate understanding of the unusual circumstances surrounding their birth. (Newswire)