Uterine Didelphys
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Uterine Didelphys is a rare type of deformity (1 in 1000 women) in the female reproductive organs in which some organs may be either split or duplicated. Typically, some of these "extra" organs are non-functional or semi-functional appendages, although on occasion they will be completely function in all normal respects, and often independently.
A UK woman with two wombs gave birth to triplets in 2006. The children consisted of 2 identical twins from an egg that implanted into one womb and then divided and a single egg that implanted into the other womb. Hannah Kersey of Northam in Devon is believed to be the first known birth of its kind.BBC Coverage