DALLAS (CBSDFW.COM) – A Dallas couple welcomed a baby girl into their family 18 months ago. But the miracle isn’t the child’s birth, but how the pregnancy happened.

The Johnson’s adopted an embryo and then mother Charis Johnson carried daughter Zoe through a complete pregnancy.

“She is my adopted child, not genetically related to me, but I didn’t have to give up the experience of being pregnant,” said Johnson.

Zoe’s birth makes the Johnsons part of a very rare, growing movement.

National Registry for Adoption is based in North Texas. The organization helps donors find families grow in less traditional way.

“This is really the earliest form of adoption,” said Dr. J. Michael Putman, Medial Director of Baylor’s Fertility Center of Dallas.

The need is staggering, according to the group, which claims there are 500,000 embryos currently in storage inside the country.

“There are couples out there, hundreds of thousands, who aren’t able to have children. So this is a very viable and important way,” said Duffy Johnson, who also adopted another girl the traditional way.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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