Scientists were successful in creating an artificial womb that grew premature lamb fetuses for four weeks. They hope to develop a similar system for human babies in the next three to five years.

Being born prematurely is the most common cause of death among babies, while even survivors are often plagued by various lifelong disabilities due to underdeveloped organs. About 10% of babies born every year in the U.S. are premature. Scientists hope their unique system of “BioBags,” fluid-filled plastic bags that serve as artificial uteruses, can make a major difference in the survival and health of these babies.