Board book surfing

David came up with a new idea to increase his crawling speed today. It started as an accident when he put his hands on a board book while crawling. Because the board book is slick on our hardwood floor, he can crawl without moving his hands. This makes his crawling somewhat faster and requires less effort. Pretty soon he worked out how to do it purposely and was very proud of himself to move around in this surf-like fashion.