shaw. not thinking clearly. does the coach allow you to be on the sidelines long enough? the next concussion could occur with the same helmet very easily. jon: some have liquid jell padding. some of them have air inflatable padding. no difference apparently. no real help. because the problem is that you think that lowering your head, because my head is covered, because i have a helmet somehow that is safe. may cut down on knee injuries and shoulders injuries but increases head injuries. it is a very dangerous sport. we talked previously on the show, jon, about the risks of dementia and brain injuries with people with prolonged problems with concussions. it s a big issue. jon: i played high school football and i liked it. i m glad i didn t go beyond high school. you are absolutely clearly very smart and have had no residual impact. we ll see how it goes as i get older, doctor, thank you. there is new research that says swaddling could be harmful to your baby s long-term health.