No, but I do ride a bicycle without wearing a helmet on short trips within my neighbourhood! In my determination, the risk of a traumatic brain injury is outweighed by the exercise I get and the relatively low risk of accident. There are all kinds of trade-offs in life when it comes to safety - we take our lives into our hands going to work or walking down the street every day without a second thought. I wouldn't say that holding our daughter on a plane is any more dangerous than riding the bus while standing up, for example.