I personally find those growth charts annoying. Here is why..
6yr old son has never been on the chart except for the first 6 months of his life. He has always been under the "chart". He is healthy now (had a tonsil issue that hindered him for a couple years) and extremely active, a small 3'7'' ish. Runs all the time. Yes he's on the small side but hey everyone is different.
And then
9yr old daughter has always been in 95% or above on the charts. She is 5ft tall and is in good shape. Her doc says she has 11 yr old bones, yada yada. Has great energy (not quite the same as my 6yr old rocket ship mentioned above but boys vs girls, everyones different) and is a healthy young girl.
So everytime they go see the doctor my daughter gets worried that she is "different" because of the chart they always mention. The same my son gets worried that he is "different" because, again, the chart they always mention.
So I have to explain yet again how everyone is different and everyone grows at different rates/times, boys/girls. Not a big deal but my daughter especially worries.
Sorry, someone brought up the "chart"
Cheers!!