DALLAS (AP) — The first birth as a result of a womb transplant in the United States has occurred in Texas, a milestone for the U.S. but one achieved several years ago in Sweden.

A woman who had been born without a uterus gave birth to the baby at Baylor University Medical Center in Dallas.

It took well over a year to determine if a woman who received the womb transplant would become the first in the U.S. to give birth, transplant surgeons in Dallas said Monday.

Baylor University Medical Center officials said at a news conference that the mother has returned home and her newborn son is fine. He remains hospitalized for monitoring.

It took months to ensure that the transplanted uterus would be functional and then many more to determine if the implanted embryo would prove viable, Dr. Tiffany Anthony said.

Officials on Friday confirmed the birth. They have declined to identify the mother, who was born without a uterus.

A birth from a transplanted uterus is a milestone for the U.S. but one achieved several years ago in Sweden.

Baylor officials said Monday that eight transplants have been performed and that one of those women currently is pregnant as a result.

Dr. Giuliano Testa, principal investigator for the uterine transplant clinical trial at Baylor, said there were lessons in the number of women who have sought to undergo the procedure.

“We are very humbled by understanding the depth of the desire of these women to carry their own pregnancy,” he said.

Baylor has had a study underway for several years to enroll up to 10 women for uterus transplants. In October 2016, the hospital said four women had received transplants but that three of the wombs had to be removed because of poor blood flow.

A doctor in Sweden, Mats Brannstrom, is the first in the world to deliver a baby as a result of a uterus transplant. As of last year, he had delivered five babies from women with donated wombs.

There have been at least 16 uterus transplants worldwide. Last month, Penn Medicine in Philadelphia announced that it also would start offering womb transplants.

Womb donors can be dead or alive, and the Baylor study aims to use some of both. The first four cases involved “altruistic” donors — unrelated and unknown to the recipients. The ones done in Sweden were from live donors, mostly from the recipients’ mother or a sister.

The transplanted uterus can be removed after birth or could remain if the woman wants another pregnancy.

Doctors hope that womb transplants will enable as many as several thousand women born without a uterus to bear children. To be eligible for the Baylor study, women must be 20 to 35 years old and have healthy, normal ovaries. They will first have in vitro fertilization to retrieve and fertilize their eggs and produce embryos that can be frozen until they are ready to attempt pregnancy.

After the uterus transplant, the embryos can be thawed and implanted, at least a year after the transplant to make sure the womb is working well. A baby resulting from a uterine transplant would be delivered by cesarean section. The wombs are not intended to be permanent. Having one means a woman must take powerful drugs to prevent organ rejection, and the drugs pose long-term health risks, so the uterus would be removed after one or two successful pregnancies.

The American Society for Reproductive Medicine issued a statement Friday calling the Dallas birth “another important milestone in the history of reproductive medicine.”

For women born without a functioning uterus, “transplantation represents the only way they can carry a pregnancy,” the statement said. The group is convening experts to develop guidelines for programs that want to offer this service.

© Copyright 2017 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.

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