A baby girl said to have spent the shortest time in her mother's womb is to be released from the hospital in Miami where she was born.

Amillia Taylor is believed to be the first baby to have survived following a gestation period of less than 23 weeks.

At the time of her birth at the Baptist Children's Hospital last October, Amillia measured 241 millimetres or 9.5 inches - no longer than a ballpoint pen. She weighed just 284g or 10oz.

Amillia was delivered via C-section after attempts to delay a premature delivery failed.

However, she was breathing without assistance at birth and even made several attempts to cry.

Doctors at the hospital attribute her survival to significant technological advances in neo-natal care.

Amillia's mother, Sonja Taylor, said she was delighted at her daughter's continuing progress.

'It was hard to imagine she would get this far. But now she is beginning to look like a real baby. Even though she's only four pounds (1.8kg) now, she's plump to me,' she said.

Doctors say the baby girl is now thriving and well enough to be cared for by her parents at home.

'It may be that we need to reconsider our standard for viability in light of Amillia's case,' a neonatalist at the hospital said.

The American Association of Pediatrics indicates that babies born at less than 23 weeks of age and 400g in weight are not considered viable.
'Over the years, the technology that we have available to save these premature babies has improved dramatically. Today, we can save babies that would have never survived 10 years ago,' he said.