DS is 7mo and just started crawling (army crawling on his tummy) in the past 2 weeks. Now that he's started to pick up the speed, he's bumping into things left and right (walls, his crib, his changing table). It's not like he doesn't see them, it's just like he doesn't realize how close they are to him. Most of the time it's a small bump and he doesn't even react and just keeps moving, but sometimes it's hard enough to make him cry (never for more than a few seconds). I watch him like a hawk, but even sometimes when I'm right there, he'll push off abruptly or roll suddenly and he hits something before I can stop him. I try to keep him in open spaces and away from walls and structures, but I also want to allow him to explore things and to learn how to navigate around the house. So I'm not sure what to do. Is all this normal? I'm getting concerned and constantly worried about concussions, etc.