Henry you started crawling at 5 months old! This is way too early to start crawling! You started by pushing off with your feet and that got you where you wanted to go. Then you added your arms to this push off method and that got you there faster. You learned that with your belly on the ground you couldn't go as fast as you wanted so this week you have started crawling on your knees! You almost have it down. I am so happy to see your determined little personality but I wish you would quit growing up!