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This is how an Australian mom got pregnant with twins 10 days apart


An Australian mom is twinning after being told she might never conceive – she somehow became pregnant with her two girls 10 days apart.

Kate Hill revealed her unbelievable double-conception, also known as superfetation, to Australia’s Seven Network this week. The Brisbane mom said she was undergoing hormone therapy after being diagnosed with polycystic ovary syndrome in 2006, which means her ovaries weren’t making eggs.

The treatment may have worked too well, as she got pregnant twice despite having unprotected sex only once during that 10-day period.

Most twins are conceived when a woman releases two eggs at the same time, which become fertilized and develop as fraternal twins. In the case of rarer identical twins, a single fertilized egg splits into two embryos to create two babies with the exact same genetic makeup.

The twin birth rate hit an all-time high in the U.S. last year, with one in every 29 babies being a twin. Experts attribute the multiplying multiples to older moms, who are more likely to have twins than younger ones, and more women are waiting to have children. Fertility drugs and in vitro fertilization also raise the likelihood of multiple births.

But Hill’s little ones are likely the result of an even rarer event. After one of her eggs became fertilized, a second egg was released by her ovaries, and also became fertilized by sperm remaining in the uterus. Women don’t usually ovulate once they conceive, however, which makes this extremely rare. There are only 10 medically documented cases of what’s called superfetation in the entire world.


(Today Tonight)

Proud papa Peter Hill joked that their double-pregnancy was a “hole in one, maybe.”

As a result, Charlotte and Olivia, now 10 months old, were born at different sizes, weights and at slightly different developmental stages. They also have different blood types.

“We actually did not realize how special that was until they were born,” Hill told Seven Network. “What makes this case even more rare, is that my husband and I only had intercourse one time – his sperm stayed alive for 10 days to fertilize the second egg released.”

Their obstetrician was just as shocked by the miracle multiples. “I could not find any literature in the medical review websites at all,” he admitted.

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