leaguers suffered concussions. twins catcher joe mauer, dominick brown and tooilg tigers catcher alex avila among them. other players including san diego s nick hundley now wonder if they ll be healthy in retirement. your responsibility is to your family first. if you continue to play through concussions and stuff and you see long-term effects of it, you know, i just had a daughter, you know, that makes it puts in perspective a little bit more. reporter: major league baseball says it s trying to better protect its players. it implemented a seven-day concussion disabled list separate from the normal 15-day disabled list, to encourage more players to admit they have a problem. now that we ve started to identify these injuries, we ll start to focus on ways to reduce it. one thing we ve done is start to study catcher helmets. reporter: mlb is especially concerned about catchers. green also says reinforce the hats are a possibility for pitchers, possibly as soon as next season.