There is a lot of talk about waring a helmet and if it does more good then harm. I have not seen a study about it yet but hope someone is working on it. I always have my helmet on not just to protect my head but the ear flaps do a wonder to keep water out of my ears.
Now for kids waring a helmet. I also keep my speed low when pulling kids. When my nephew starts to ride I will be purchasing him one and it will be required for him to ride. If nothing else it will keep his hair out of his eyes. Sorry I am not much help but if you have a little extra padding it should help if it is put on correct.
2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill