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A pregnant woman in Arkansas learned she was pregnant again when she went in for a routine ultrasound. The babies are not twins, and were conceived two and a half weeks apart.

This is an extremely rare medical occurrence called superfetation, with only 10 other cases being reported. The phenomenon is much more common in animals, due to a delay of implantation.

In June, doctors located Todd and Julia Grovenburg’s growing baby girl Jillian, and noticed a smaller baby growing beside her.

The baby boy, Hudson, is due two and a half weeks after his sister.

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