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'World's Tiniest Baby' Born Weighing Just 245 Grams -- Same As An Apple

A newborn girl weighing 245 grams and believed to be the world's tiniest surviving baby has beaten the odds and gone home as a healthy infant.

A San Diego hospital revealed the birth of the girl, who was born in December, and said she is believed to be the world's tiniest surviving premature newborn.

The girl was born 23 weeks and three days into her mother's 40-week pregnancy.

Doctors told her father after the birth that he would have about an hour with his daughter before she died.

Photo: AAP

"But that hour turned into two hours, which turned into a day, which turned into a week," the mother said in a video released by Sharp Mary Birch Hospital for Women & Newborns.

More than five months have passed, and she has gone home as a healthy infant, weighing two kilograms.

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The baby's family gave permission to share the story but wanted to stay anonymous, the hospital said. They allowed the girl to go by the name that nurses called her: Saybie.

Her ranking as the world's smallest baby ever to survive is according to the Tiniest Baby Registry maintained by the University of Iowa.

Photo: AAP

Dr Edward Bell, a professor of paediatrics at the University of Iowa, said Saybie had the lowest medically confirmed birth weight submitted to the registry.

But "we cannot rule out even smaller infants who have not been reported to the Registry," he said in an email to The Associated Press.

The hospital said the girl officially weighed 7g less than the previous tiniest baby, who was born in Germany in 2015.

In the video produced by the hospital, the mother described the birth as the scariest day of her life.

She said she was taken to the hospital after not feeling well and was told she had preeclampsia, a serious condition that causes high blood pressure, and that the baby needed to be delivered quickly.

Photo: AAP

"I kept telling them she's not going to survive, she's only 23 weeks," the mother said.

But she did. The tiny girl slowly gained weight in the neonatal intensive care unit.

A pink sign by her crib read "Tiny but Mighty".

The girl faces enormous challenges as a micro-preemie, who is an infant born before 28 weeks of gestation. Micro-preemies can experience vision and hearing problems, developmental issues and a host of other complications.