The bellybutton is a scar which occurs when the umbilical cord is removed after birth. The umbilical cord is what connects the feotus to the placenta of the mother and is how the feotus is fed by the mother whilst in the womb. Related links: http://www.nhs.uk/chq/Pages/2299.aspx?CategoryID=54&SubCategoryID=128 (NHS umilical cord) http://en.wikipedia.org/wiki/Belly_button
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