When Rumaisa Rahman was born, she weighed just 8. 6 ounces — less than a can of soda. Three months later, doctors say she's doing "extremely well," and will be introduced...

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CHICAGO — When Rumaisa Rahman was born, she weighed just 8.6 ounces — less than a can of soda.

Three months later, doctors say she’s doing “extremely well,” and will be introduced today by Loyola University Medical Center in Maywood, Ill., as the world’s tiniest surviving baby. Rumaisa was born 1.3 ounces lighter than the previous record holder in 1989. She was 9-3/4 inches long at birth, or about half as long as a full-term baby.

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Rumaisa, whose name means “white as milk,” was born at the hospital on Sept. 19 along with her fraternal twin sister, Hiba, who weighed 1 pound 4 ounces. Hiba’s name means “gift from God.”

Their mother, Mahajabeen Shaik, 23, of Hanover Park, gave birth by Caesarean section after 25 weeks and six days of gestation. A typical, full-term pregnancy is about 40 weeks. Shaik entered a hospital early because she had developed severe pre-eclampsia, high blood pressure, which was affecting her health as well as Rumaisa’s activity in the womb.

Shaik and her husband, Mohammed Abdul Rahman, 32, both originally from Hyderabad, India, could not hold their daughters until their second month because the babies were hooked to IVs and were inside incubators. The babies were conceived naturally, hospital officials said, and are the first children for the couple.

Rumaisa now weighs about 2 pounds and 10 ounces, and her sister weighs about 5 pounds.

“All indications are there’s an excellent prognosis for a normal development,” said Dr. Jonathan Muraskas, professor of pediatrics and neonatal-perinatal medicine at Loyola University Chicago’s Stritch School of Medicine.

Both girls underwent laser surgery to correct vision problems that are common in premature babies.

Doctors say they are doing well, taking all their feedings by bottle and receiving some minimal oxygen to help with respiratory functions because their lungs have not completely matured.

Hiba may be discharged from the hospital by Christmas, hospital officials say. Rumaisa may go home the first week in January.

The previous record holder for world’s smallest baby, Madeline Mann, goes to high school in Hoffman Estates, Ill., and celebrated her 15th birthday in June . She also was born at Loyola after her mother developed pre-eclampsia.