Bullcamp82834 hit on what my comment is ... fit.

I have come across so many kids' setups and short adults' that simply had way too long a length of pull long gun. If you can afford to, have a stock cut to fit the kids. They will grow like weeds, that is true, and soon need a longer LOP .... but the LOP is a big deal right now as far as comfort shooting. And if I am not wrong Savage offers a youth length stock for their Axis rifle at a reasonable price.