I think the line you are talking about is called Linea Nigra. Sometimes it is hairy, sometimes it is not.
BTW it can be found in men as well. It is most common in pregnancy but sometimes people can get this during puberty.
It is thought to start due to estrogen.
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~ I've learned that people will forget what you said,
people will forget what you did,
but people will never forget how you made them feel. ~
Maya Angelou
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