Growing too fast

Holy cow! Travis almost army crawled off my bed today! Ok so it was a modified army crawl; he pushes up with his feet tucked under his tummy and then thrusts forward till his little arms are under him. Then he pushes back up and repeats. Can someone tell him that he is only four months and he needs to slow down!!! If he is going to be my last he needs to take things a little slower!