MIAMI —  The world's smallest premature baby will remain in the hospital a few more days as a precaution, hospital officials said Tuesday.

Barbara Moore, spokeswoman for Baptist Children's Hospital, said she did not have further details on why the doctors changed their mind about sending Amillia Sonja Taylor home Tuesday.

Doctors say Amillia is the first baby known to survive after a gestation period of fewer than 23 weeks. She was just 9 1/2 inches long and weighed less than 10 ounces when she was born Oct. 24. She was delivered after just under 22 weeks of pregnancy; full-term births come after 37 to 40 weeks.

The baby has suffered respiratory and digestive problems, as well as a mild brain hemorrhage, but doctors believe the health concerns will not have major long-term effects.

"Her prognosis is excellent," said Dr. Paul Fassbach, who has cared for Amillia since her second day.

Amillia was conceived in vitro and has been in an incubator since birth. She has received oxygen and will continue to get a small amount even after she goes home.

She is the first child for Eddie and Sonja Taylor of Homestead. She was delivered by Caesarean section and now weighs about 4 1/2 pounds and is just over 15 1/2 inches long. Previously doctors stated she was about 25 inches long.