Learning fast

My nephew is about 7 months old right now. My main job during this one month vacation is to play with him-everyday!
From able turning his body only a month ago, now he can 'crawl' already. well, He is not really crawling with the support of his knee on the floor (like crocodile?), he is actually moving his body forward by pushing it with the sole (feet), so it looks like a fish moving forward on the floor..hahaha

He was really get excited once he knew how to crawl and keep moving around everyday. And this day, he tried very hard to "climb" up to a board underneath a small table in the living room. Lying on the board and he doesn't know how to get down. All of us were too bad but watching him instead of assisting him. He tried many methods and eventually he turned his body at 180 degree, and slowly moving down....I dun understand why he wanted to turn his body 180 degree but at least he learned a lesson. from that time on, he crawl up the board everyday and tried many many different and weird methods to get down...Huh, children are learning fast yaa....anything to do with the milk powder containing DHA??