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fetus in fetu

Newborn Baby Gives Doctors A Shock After They Discover Her Twin Is Growing Inside Her Abdomen
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"Fetus-in-fetu" is a very rare condition where a baby is born with another, partially formed fetus developing somewhere inside their body.

The exceedingly rare (around 1 in 500,000 births) condition recently caused doctors to deliver a Columbian woman's baby early via cesarian section, according to The New York Times.

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