Fox News reports, one of the youngest babies born was released from NICU (Neonatal Intensive Care Unit) in Germany.  The baby girl was born at 21 weeks gestation and weighing only 16 ounces was in the NICU for 5 months.   When she was released she weighed 7lbs 11oz. 

This is a miracle because some hospitals across the globe only give lifesaving care to babies that are at least 24 weeks gestation. 

In 2009 USAToday reported on a study by Sweden researchers that said:

Among babies born alive at 22 weeks, fewer than 10% survived; at 23 weeks, 53% survived; at 24 weeks, 67% survived; at 25 weeks, 82% survived; at 26 weeks, 85% survived, the study shows

The study also says that:

91% of babies born alive were admitted to the neonatal intensive care units, or NICU. Of babies born alive, 70% survived to their first birthday.