W.W.
welcome to mamapedia, P..
Why not let them be kids? Stop worrying about their growth, unless there is a BIG problem that the doctors even notice.
Let them be kids. According to the old wives tale, my oldest was supposed to double in height at the age of 2 to 18. That means he should be 6' tall. He's not. He's 19 and 5'10. He's not short but he's not as tall as the "growth chart" says he should have been. I'm not worried about it. Neither is he.
Stop. Unless they stop growing? Then worry. Until then? Let them be kids.