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[quote=Anonymous]OP, there is an incorrect assumption underlying your question that most people see to believe.

Let’s discuss how the cdc growth curves are actually created. The 90th percentile curve for height does not track a kid that at the 90th percentile over time. It does not even track the average of all 90th percentile kids over time. It is composed of data points of the 90th percentile height at each time point. So the data point at age 10 includes kids who were 20th percentile 5 years ago and 99th percentile 5 years ago. They include kids who will be 50th percentile at age 17 and 95th percentile at age 17. The data points are then “smoothed” to create a nice curve.

There is no data to show that kids are destined to stay on their growth curve, and we see it every day - Johnny was the smallest in 9th grade, but then he got his growth spurt and is now 6’5”. Teddy was the tallest in 6th grade but he stopped growing at 5’8”.

https://www.nytimes.com/2020/04/17/parenting/growth-chart-accuracy.html?unlocked_article_code=1.yE4.VVqE.LdRzu_kSg-M3&smid=url-share

https://jamanetwork.com/journals/jamapediatrics/fullarticle/1867333
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