Learning to walk in a world of hard surfaces can turn a special moment into a heart rendering incident in a flash. It’s normal for young children to sustain bumps and bruises occasionally as part of exploring; the problem is this kind of fall is very common in even the safest of homes and gardens. The damage to a falling toddler’s hands and knees can be an acceptable form of pain for learning but a head injury can be traumatic for both infant and parent.
It’s the ‘Thudguard’ (not to be confused with the Thagomizer) As a parent, I know that kids are built to withstand a fall from approximately their height. I’ve had discussions about bike helmets with people before, and my rule is if the surface is paved, then wear the helmet. I observed a neighbor who was teaching their daughter to ride a bike. She fell, and her mother made quite a big deal about how if she hadn’t been wearing the helmet, she would have smashed her head. From whare I was standing, I could see what really happened. The kid & bike tipped over, and once they were on the ground, the kid let their head & helmet hit. No helmet, no impact.