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[quote=Anonymous][quote=Anonymous]https://www.cdc.gov/growthcharts/data/set2clinical/cj41c072.pdf

Average age of menarche is 12.4, looking at 50th height percentile, the average girl gains about 3.5 inches after age 12.4.[/quote]

Thanks for looking this up! It's good to have an idea at the population level. Important to also remember that:
1) Few people are truly "average." Although it does seem like the changes for the different percentiles are similar, individual kids may hit growth spurts at different ages.
2) Age at menarche is only indirectly considered here. A given girl may or may not have already hit menarche at age 12.4.

We've already seen a bunch of this variation described here - in conclusion, no one can know exactly, but this kind of growth chart + the parents' percentiles are probably the best predictors. I'm not aware of a growth chart that includes age at menarche, but I'd guess that even with it, parents' height percentiles matter more (I say "height percentiles" because my husband is taller than me, for instance, but he's 15th percentile for men and I'm 60th for women. Son trending after me and daughter after him.)

And again, this is **average**... gaining 1 inch, gaining 3 inches, gaining 5 inches... none of this is "abnormal" unless there are other things going on. (Like some clear hormonal issue.)[/quote]

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