. >> dare roughen grew up playing on the gridiron, now he coaches players on the berry farm beavers? the northeast. like thousands of coaches across the league, he'll be opening his season with news rules about how much player contact will be allow. >> i think this will help eliminate the concussions for the kids that's playing, because sometimes you may not know if the kid has a concussion or not. >>> most pop warner kids practice nine hours a week, now only one third of that time can be spent in contact with another player. head to head hits will not be allowed and tackling must be initiated within a three-footprint zone. in neurologist treats patients with concussions and brain injuries at the rehabilitation hospital in northwest d.c., he says it's especially important to prevent concussions in younger athletes whose brains are still developing. children, of course, are in school. the last thing they need is to be taken out of school. >> reporter: parents say the new attitude gives them peace of mind. >> it's a sense of comfort, knowing that he's not going to get hit all the time.

s berry farm beavers, ready to pass along new guidelines. >> it's very important to start teaching at a young age. coaches need to teach how to tackle, not with the top -- not using the top of the helmet. >> pop warn erbil's new concountries awareness focuses on what happens with a typically week. now only one third of that time can be spent in contact with another player. head to head hits will not be allowed. tackling must be initiated. >> michael yokel son treats patients with concussions and brain injuries at the hospital in northwest d.c. he says it's especially important to prevent concussions in younger athletes whose brains are still developing. >> this has gone beyond just the nfl. this has gone beyond just brain injury specialists like myself being aware of it. it's getting to the point that children from a very young age are aware. >> reporter: parents with kids in the league say the new attitude gives them peace of mind. >> it's a sense of comfort, knowing that he's not going to get hit all the time. >> i think particularly with concussions, solve of it was just a lack of