Dave Tilley:
… regularly tracking growth from a young age, as well as monitoring other aspects to athletes (resting heart rate / heart rate variability, perceived fatigue, sleep, movement screening, etc), is essential for coaches or healthcare providers involved in youth sports. …
HOW TO TRACK GROWTH AND DEVELOPMENT IN YOUTH ATHLETES
Click PLAY or watch it on YouTube.
related – A quick and easy way to anticipate pubertal growth spurt is to ask kids if they’ve recently needed bigger shoes. Distal body parts grow first.
While not foolproof, it’s a useful first tool.
Gymnastics Coaching.com 