Coaches and league officials are emphasizing attempting to take further steps to prevent head injuries.
Federal prosecutors say 58-year-old David Marshall received a 27-month sentence Wednesday. He had pleaded guilty in January to wire fraud.
Researchers believe the youngsters should have some of the same medical examinations and interventions as older football players.
From 2000 to 2009, the most recent figures available show that the number of kids playing baseball fell 24% and despite concerns about concussions, youth football has soared.