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Identical twins Gillianne Gogas and Nicole Patrikakos were born together — and now the sisters have given birth together in mind-boggling synchronicity.
The 36-year-old-sisters both gave birth on the same day in the same hospital, the Epworth Freemasons in east Melbourne.
Gillianne said they both felt a mix of emotions over their matching maternity experience.
"The timing, you just can't plan something like that. So yeah, disbelief, shock, excitement, all of those emotions," Gillianne told 9News.
Gillianne's son, Alexander, arrived on August 22 at 1.20pm, followed by sister Nicole's baby boy, William, a mere five hours later.
Nicole said the sisters had the same due date, so the duplicate deliveries were seemingly meant to be.
"(We were) very close growing up. We have always done everything together so this is just another example of that," she said.
Gillianne said they had nine months of pregnancy to process their "tandem" due date.
"And yet it is still quite unbelievable," she said.
But the duplicity didn't end there.
"We have always sort of done things in sync," Nicole said.
The identical twins were delivered by the same obstetrician, Dr Joseph Sgroi.
The top doctor said the twin births were a first for him and the Epworth Freemasons medical team.
"It is not something that is common. It is not commonplace for even sisters to give birth on the same time or on the same day," he said.
The newborns even had the same birth weight, a healthy 3.5 kilograms
"Oh yes that came as another surprise," Gillianne said.
"Exactly the same," Nicole said.
Sgroi said the baby cousins were actually biologically more like brothers.
"You have got two identical twin girls having their babies at the same time," he said.
"We know that they share 100 per cent of their DNA so these two boys, whilst they may be cousins they are actually more akin to brothers in terms of their gene pool."
There is a slight difference between the sister's parenting journeys; this is Nicole's first child and Gillianne's third.
For their husbands and wider families it makes remembering the boys' birthday in future years pretty easy too.
The pair agreed it would be "an extra big celebration" every year.
Both Nicole and Gillianne live just streets away from one another in Melbourne's inner north.
Throughout their lives the identical twins have shared so much together but having babies on the same day takes it to a new level of "twinning".
"Hopefully they will be as close as we are because it really is a special bond that we have," Nicole said.