I have been surprised at the number of parents I have seen, who are either unaware or choose to ignore the changes in car seat recommendations for children under the age of two. I try to discuss car seat safety at each check-up appointment, and have always been especially mindful of doing this at the one-year check up.
It seems that more and more kids are participating in organized sports at even younger ages. I now have many 3 year olds who are already playing on a soccer team, and kindergartners in football and lacrosse. They are also "specializing" in a sport at younger ages as well. With the focus on one sport at even earlier ages the risk of overuse injuries seems to be greater.