I might be very off base here, but I had the impression that the onset
of menarche was determined by several things including heredity and
weight/size. I think I remember reading that girls don't usually begin
this stage until they have reached 105# or more. Perhaps the increased
weight, vitamins and readily available food in the US has caused the
younger ages we are perhaps seeing?
--
Denny Rice, RN, IBCLC
Dallas Texas USA
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