Biking is a popular form of physical activity for children that has risks for injury to the head. Research shows that children who rode bicycles without a helmet are 14 times more likely to experience a fatal crash compared to children wearing helmets. Safe Kids provides safety tips on how to ensure that your child has a properly-fitted helmet. Helmets should not rock side-to-side when shaking your head and the strap below the chin should always be fastened. When you open your mouth wide, your helmet should feel snug around your head, otherwise tighten your straps!