When my first son was little, (he is 32 now), we only had tile floors. Did he bump his head, yeap! sore scraped knees, yeap. Oh he started crawling at 4 mths. By the time he started walking was 6 mths. I have pics. and eyewitnesses to prove it. I really think he disliked the tile floors, made him mad, said crawling not is for me, and started walking. What do you think Native Americans and Pioneers did with their little ones? Children adapt, and cope with their living conditions. So no worries. Just let your little one go, no rubber mats, or knee guards, just go with the natural flow.