Melinda Star Guido, seen at 14-weeks old with her mother Haydee Ibarra, weighed only 9½ ounces at birth, less than a can of soda.

LOS ANGELES — One of the world's smallest surviving babies is headed home.

Melinda Star Guido weighed only 9½ ounces at birth— less than a can of soda. After spending her early months in the neonatal intensive care unit, a team of doctors and nurses will gather today to see her off.

Melinda has been growing steadily and gaining weight since she was born premature at 24 weeks in August at the Los Angeles County-USC Medical Center. She is the world's third smallest baby and the second smallest in the U.S.

Now weighing 4½ pounds, doctors said Melinda has made enough progress to be discharged. It's too early to know how she will fare developmentally and physically, but doctors planned to monitor her for the next six years.

Most babies this small don't survive even with advanced medical care. About 7,500 babies are born each year in the United States weighing less than 1 pound, and about 10 percent survive.

A study published in the journal Pediatrics in 2010 found that many survivors have ongoing health and learning concerns. Most also remain short and underweight for their age.

There are some rare success stories. The smallest surviving baby born weighing 9.2 ounces is now a healthy 7-year-old and another who weighed 9.9 ounces at birth is an honors college student studying psychology.

Soon after birth, Melinda was treated for an eye disorder that's common in premature babies and underwent surgery to close an artery.