In what is believed to an Australian first, a mum has delivered four naturally conceived, identical girls after a “one in 15 million” pregnancy.

Queenslander Jenitar Na’amoana already had four children when she fell pregnant.

However, the big shock was still to come.

In what is believed to be an Australian first, 34-year-old Na’amoana has defied the odds and delivered four naturally conceived, identical girls.

The quadruplets emerged from a “one in 15 million” pregnancy, splitting into four from a single fertilised egg.

Na’amoana quickly became a mother of eight after delivering her girls by C-section at just over 28 weeks at the Royal Brisbane and Women’s Hospital surrounded by a huge support team last week.

“This is unheard of … we don’t think it has ever happened in Australia,” the hospital’s Alexa Bendall said.

“There may have been a couple of cases elsewhere in the world and when I say a couple, literally two.”

Na’amoana was still breastfeeding the youngest of her four children when she learned she was again pregnant.

Then she and husband Jortham got the surprise of their lives when told their “little miracle” would be a medical marvel.

“When they went along and found out they had four babies instead of one they were quite shocked,” Bendall said.

All four baby girls arrived healthy, but with some growing to do. Photo: AAP

Emily, Harriet, Catherine and Alexa – the latter named after Bendall – arrived on July 14.

Emily weighed 1025 grams, Harriet was 1121, Alexa tipped the scales at 1120 grams and Catherine was the heaviest, weighing 1151, at birth.

“Our precious miracles have arrived safely and while our hearts are overflowing with gratitude, the reality of caring for four newborns at once has brought challenges we never could have imagined,” Na’amoana wrote on a GoFundMe.

The family has set it up to raise money to help the girls with medical, travel and everyday living expenses as well as a van “with at least 10 or 12 seats”.

Bendall has cared for Na’amoana since she discovered the surprise news of her bundles of joy.

“They are very special. We are very excited to be able to care for this amazing little family, well big family now,” Bendall said.

“One is named after me, which is such a beautiful tribute.”

The pregnancy was considered very high risk but Na’amoana had “taken everything in her stride from day one”, Bendall said.

“We have never seen a spontaneously conceived pregnancy of this type with quads, and she has somehow dodged every complication and risk for both herself and her babies to be here today, with four gorgeous newborn girls.”

The girls were expected to spend some time in hospital before being allowed home but their long-term outlook looked really good, Bendall said.

-AAP