Here is another amazing strange fact about pregnancy!
In 2009, Todd and Julia Grovenburg of Fort Smith, Arkansas, received international media attention for Mrs. Grovenburg’s conception of an additional child while already pregnant with a child conceived two and a half weeks earlier. The term is called “Superfetation” which means simultaneous occurrence of a second conception during pregnancy, giving rise to embryos of different ages in the uterus.
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Information Source: Wikipedia