Dec. 19, 2017 -- A healthy baby girl born last month in Tennessee was a frozen embryo for 25 years, making her the longest known frozen human embryo to result in a successful birth.
The previous known record was 20 years, CNN reported.
Emma Wren Gibson was born November 25 to parents Tina and Benjamin Gibson. As an embryo, she was was frozen on Oct. 14, 1992 and thawed March 13 at the National Embryo Donation Center. She was conceived the year after her mother, Tina, was born.
"Do you realize I'm only 25? This embryo and I could have been best friends," Tina said when told the age of the embryo when she received it, CNN reported.
Emma was 6 pounds 8 ounces at birth and 20 inches long.
"I just wanted a baby. I don't care if it's a world record or not," Tina, now 26, told CNN.
Benjamin is infertile due to cystic fibrosis.
Emma and four sibling embryos came from the same egg donor and were created for in vitro fertilization by another, anonymous couple. These "snowbabies" remained in frozen suspension until they could be use by people unable or unwilling to conceive a child naturally.
Emma's birth is "pretty exciting considering how long the embryos had been frozen," Carol Sommerfelt, embryology lab director at the National Embryo Donation Center, told CNN
While she's the longest known frozen embryo to result in a successful birth, it can't be confirmed whether Emma represents a new record.
"Identifying the oldest known embryo is simply an impossibility," Dr. Zaher Merhi, director of IVF research and development at New Hope Fertility Center, told CNN. He was not involved in Emma's case.
U.S. companies do not have to report to the government the age of an embryo used, only the outcome of the pregnancy, so "nobody has these records," Merhi explained.
Other experts cited a case study of a 20-year-old frozen embryo that resulted in a successful birth, CNN reported.