Why don't parents make their kids wear helmets? Makenna wears hers on her bike and scooter. My other friend with a 3 yr old across the street makes her wear one too. My friend across the street that has a daughter same age as Makenna (3) says she doesn't need one because she has training wheels. They have never made their son wear one either. Makenna has fallen off her bike several times (I adjusted the training wheels last night) and has needed it. I look at helmet like a seat belt, she makes her kids wear those. it just doesn't make sense.