Some time between 8 and 10 months most babies begin to crawl. A few months later, they're walking. And once they become independently mobile, they discover that there's a big, exciting world out there to explore.
Children learn about their world by exploring.
It's our job to make sure their explorations are as safe as possible. You would be amazed at how different the world looks when viewed from somewhere between one and three feet off the ground. I suggest to all parents of crawling and walking babies that they crawl around their houses or apartments and take a look at the world from their babies' perspectives. From that vantage point furniture legs and table edges become much closer to heads and eyes. Appliance and lamp cords that we don't see are perfectly visible when you view furniture from it's underside.