The 24th million Australian has arrived.
At 12.51am on Tuesday, the Bureau of Statistics' population clock ticked over to mark the milestone.
And while there is no official 24 millionth person - it could have been a baby or a new migrant arriving - Peina Milosia's son would have to come close. 
Little Brandon Oliver was born at about 1.29am on Tuesday at Fairfield Hospital in south-western Sydney.
"I had no idea Australia was close to reaching its 24-millionth person until the doctor came in and told me," Ms Milosia, from Wetherill Park, said.
"Definitely I'll tell him when he's older that he was close to being the 24 millionth person. He's doing well, he's sleeping now."
Ms Milosia and her husband, Lui, were both born in Samoa but have given birth to their four children in Australia. 
"It feels great and I'm happy they were born in Australia because it's a different life here," she said.
While Ms Milosia was born in Samoa, she spent her childhood in New Zealand and migrated to Australia about 14 years ago following in the footsteps of other family members.
She said she was optimistic about her children growing up in an increasingly populated Australia, with no concerns about the future of the country.
???The nation's population increases by one person every one minute and 31 seconds based on births, deaths and net overseas migration rates.
The population has jumped by a million people to 24 million in the record time of two years, nine months and two days. 
Robust migration, high birth rates and longer life expectancy has fuelled the faster than expected arrival at the 24 million population milestone.
Drawing on Australian baby name and birth data, demographer Mark McCrindle found that the 24th million Australian was most likely to be a baby boy named Oliver, born after midnight on   February 16, in the western suburbs of Sydney. 
Brandon Oliver will most likely be two when the population jumps another million to 25 million in 2018.