Snowmobiles can weigh up to 600 pounds and travel at speeds in excess of 90 mph. Head injuries are the leading cause of snowmobile-related deaths. In 1998, nearly 800 children ages 14 and under were treated in emergency rooms for snowmobile-related injuries. The American Academy of Pediatrics has stated that operating snowmobiles is inappropriate for children under age 16. If a child is riding as a passenger on a snowmobile, be sure he is wearing an approved helmet.