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In 1992, Tina Gibson was nearly 2 years old when a couple donated embryos that were frozen in a clinic in the Midwest.

In February 2020, one of those embryos was implanted in Ms. Gibson, an elementary schoolteacher in Knoxville, Tenn., and in October, she gave birth to a 6-pound, 13-ounce baby. Ms. Gibson and her husband, Ben, named her Molly.

The birth broke the record for the longest-frozen embryo to result in a live birth. That record, according to the National Embryo Donation Center in Tennessee, was set in 2017, when Mollys older sister, Emma, was born after an embryo from the same donor couple was implanted in Ms. Gibson.

We feel so blessed that God so long ago decided this was going to be our family, Ms. Gibson said. I cant imagine having any other kids but these kids. Theyre just meant to be ours.

Mollys birth is the result of a process that began when an embryo was frozen on Oct. 14, 1992. It was thawed in February 2020, the longest time an embryo had been frozen before it led to a live birth, said Martha Earl, director of the University of Tennessee Preston Medical Library. She said she had researched medical journal articles and had found no published case in a medical journal of a live birth of an embryo that had been frozen more than 20 years.

Mollys birth shows that there is not a limited length of time an embryo can be frozen, even though freezing techniques have changed significantly since the 1990s, said Dr. Jeffrey Keenan, director of the National Embryo Donation Center, a Christian organization that performed the transfers.

If the embryo survives the thaw well, it should have just as good a chance as freshly created embryo, he said. No embryo is too old.

The birth is an exciting development that will allow fertility doctors to reassure prospective parents that an embryo frozen for years, even decades, will remain viable, said Dr. Mindy S. Christianson, the medical director at the Johns Hopkins Fertility Center.

Patients often ask how long can embryos be frozen, she said. Often, the answer is, We dont really know. Now we can say with confidence there have been babies born from embryos that have been frozen for 27 years.

Dr. Sigal Klipstein, director of the egg donor program at InVia Fertility Specialists in Chicago, said that the length of time an embryo spends frozen is not an important data point for fertility doctors.

The issue is the quality of the embryo at the time of freezing, she said. If its a good quality embryo, we anticipate that it will remain a good quality embryo at the timing of the freezing and at the timing of the thaw.

Ms. Gibson said she and her husband had decided to use donated embryos after seeing a news story about a woman who had tried to get pregnant the same way.

The Gibsons had struggled for five years to adopt a child, but the process was riddled with setbacks. They were hesitant to pursue in vitro fertilization because Ben, 36, has cystic fibrosis, and Tina, 29, learned she was a carrier. Ms. Gibson said they feared passing the condition on to their children.

When they began researching donor embryos at the donation center, they learned about the donor parents ages, their physical characteristics, their educational and medical backgrounds and even their hobbies. The ages of the embryos were not listed.

Ms. Gibson said she had been nervous about that at first but had felt better after Dr. Keenan told her it would make no difference in the babies health.

Both pregnancies went smoothly, she said. Both are perfectly healthy. The age of the embryos is something the couple now laughs about.

We always joke that Emma is an old soul, Ms. Gibson said. She does something and Ill say, Thats the 90s baby coming out in you.

Dr. Keenan said his center had had nearly 1,000 live births from donated embryos, a process that is far less expensive than going through I.V.F.

After using the process to form their own families, biological parents with fertilized eggs left over have several options: donating them to others, discarding them, donating them for medical research or keeping them frozen indefinitely.

Dr. Christianson said that at her practice, she had seen an increase in the number of people donating embryos, a trend she believes has to do with the increase in embryos that people do not need for I.V.F.

Generally, people still feel ambivalent about giving their embryos away, knowing that other families may raise their biological children, she said.

Its definitely not the most common choice, Dr. Christianson said.

Dr. Klipstein said that at her practice, fewer than 1 percent of patients chose to donate their remaining embryos.

It feels very different to donate embryos once you have your own children, Dr. Klipstein said. You still have that connection to the genetic material you created.

Many donors seek an ongoing relationship with the people who will be given their embryos, Dr. Keenan said.

Shane and Tiffany Ogle decided to donate their four remaining embryos after they had their twin boy and girl through I.V.F. One of those embryos led to the live birth of a girl about three years ago. They visit the child once or twice a year and get regular updates from her parents.

Donating the embryos was a no-brainer, said Tiffany Ogle, 40, who lives in Maryville, Tenn., 18 miles south of Knoxville.

When we learned that it was an option, it felt like a gift that we could give another couple, she said. We understood from the beginning that this was not our child. This is our DNA, but this is someone elses family and child.

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Girl Is Born in Tennessee From Embryo Frozen for 27 Years - The New York Times