I used to worry about that, too, but had four children to live through it without brain damage. When my youngest was crawling, she pulled on a cord of a clock radio that was up high that my son had placed there temporarily and forgotten to move, and the clock fell onto her head and left a hole that quickly filled with blood. I rushed her to the ER and the doctor told me that kids heads and other bones in their bodies are very resilient, much more than ours as adults. He had seen a child who fell out of a second story window, and had not one broken bone. This is because their bones are not as dry as ours as adults, so they are able to withstand a lot more trauma than adults can. My second oldest child used to beat her head into an iron radiator whenever she was angry and my doctor then told me to quit worrying, that she would quit when it made her pass out and I was shocked at that answer! He said babies' brains are very protected and it takes an extreme amount of force to cause brain damage. So I quit freaking out and she quit banging her head! No reaction anymore, see? Do what you can do by making his environment safer, padding sharp corners of coffee table or fireplace hearth, etc. and he will be fine. Pretty soon, he'll be walking steady and this phase will pass. I think us mothers would prefer to put little helmets on them, but they do survive this falling/hitting head thing, just as we did.