A woman who received a uterus transplant has given birth to a baby -- a first in the US, Time reports. She is part of an ongoing uterine transplant clinical trial taking place at Baylor University Medical Center at Dallas and she, like the other women in the trial, has a nonfunctioning or nonexistent uterus. Her uterus was donated by another woman, Taylor Siler, who wanted to be able to give someone else the opportunity to have a child. The trial, which accepts both living donations, like Siler's, and donations from deceased individuals, will complete 10 transplants. Eight have been completed already and while at least three have failed so far, a second trial participant is now pregnant following a successful transplant.