WASHINGTON (AP) — Is peewee football too early to wonder about concussions? Maybe not: A major report says far too little is known about the risks in youth sports, especially for athletes who suit up before high school.

And it’s not just a question for football. The Institute of Medicine found no one knows how often the youngest athletes suffer concussions or which sports have the highest rates. Nor is it clear if better headgear ever will help.