eventually, doctors were able to figure out the reason behind everything. It turned out that Fairchild was a chimera, which essentially means that she had the cells of a lost twin in her ovaries. “A chimera or a person with chimerism is an odd sort of twin,” explains a 2009 Yahoo report. “A chimera happens when two fertilized eggs fuse in the womb. If the fusion does not happen, the result would be fraternal twins, but when it does happen, you get a twin that is not visibly a twin at all. Most chimeras have no idea and will never have any idea that they were and technically are a twin. Visibly, there is no difference, although, a chimera may have two different colored eyes. The real signs are in the DNA.”

Woman Gives Birth to Children, Discovers Her Twin is Actually the Biological Mother, But She is Technically Her Own Twin Saturday, February 1, 2014 @ 2:53pm