Prenatal testing often involves taking mom's blood in search of baby cells. I'm not remotely surprised baby cells remain. This article is fun though, and fascinating.
Probably the best quote from the article: "Dr. Boddy, Dr. Sayres and their colleagues suggested that fetal cells may produce chemicals that influence the mother’s biology, allowing fetuses to manipulate her from within."
http://www.nytimes.com/2015/09/15/science/a-pregnancy-souvenir-cells-that-are-not-your-own.html
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