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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]What’s with all these 10 and 11 year old kids getting their period! Yikes.[/quote]

This is nothing new.  There’s just message boards now to discuss periods versus previous generations where most females never discussed their periods openly.  [/quote]

It has trended earlier over the years though.  Estrogen-like chemicals in our environment.  Probably different nutrition as well - more body fat leads to earlier periods.  [/quote]

This is actually not true.  I researched this last time there was a thread on DCUM and found:  the age of first period has stayed roughly the same since the start of the industrial period -- average onset of 12 years, 7 months for Caucasian girls, a couple months earlier for African-American girls (sorry I can't remember where Asian and Latina girls fell but it wasn't much different).  However, the age of first signs of puberty (e.g., breast buds and pubic hair) has been moving up over the last few decades, most likely due to the estrogen-imitator chemicals in the environment.  
And, I think the stats were that 90% of girls get their first period within 2 years of the average.  Which means that 10% of girls will get it either before 10 1/2, or after 14 1/2 - so a girl getting her period at 10 is earlier than most, but not a statistical freak by any means.  
The strongest predictor for when a girl would get it, is actually the age at which her mother got it.  Athletic activity and body fat are the other major indicators, but generally the genetics will prevail unless the daughter has a significantly different body type or activity level than her mother (e.g., a competitive athlete probably will not get it as soon as her mother did).

To the OP's question, I think I grew about 4 inches after getting my period.  I think the PP that said that most girls will only grow a couple of inches after getting their period is probably right, but it seems that there's a of variation here.  The best predictor for height is parent's height -- there's an online tool, but I think for girls it's something like you average the mom's height with the dad's height minus 6 inches, and 90% of girls will be within an inch or two of that height, assuming both the parents and the kid had normal nutrition growing up.  [/quote]

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