Hi,
I started my period late (age 16). It could've been due to genetics (because I think my mom started late too) or it could've been because I was very skinny at that age.
My cycles were always very long in the beginning. I only had 6 periods/year for the first few years. In my 20's, they started to become more regular and closer together.
Just like everyone said, it could be because she's thin (if she is thin) or it could be just because she's young and her periods haven't regulated yet.
She could always just go and see what the OB has to say for peace of mind. Some OB's will start on birth control to regulate things, but if she doesn't care that her periods are spaced apart, then I would just wait until they regulate themselves.
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Leah 26 w/CF, RN, 10 weeks pregnant, mom to non-biological son born 2/4/07
<img src="http://i222.photobucket.com/albums/dd53/rubyroselee/Xmas07-MarieKens-LeahLandon.jpg">