Cruising main and Stairstepping for babes

I'm in for trouble now! My baby is growing up so quickly. Jack is crawling all over the place, and climbing the stairs too! He started a few days ago with just a few real crawls. Yesterday he did several more crawls in a continuous sequence. And today he was off, clipping along at cruising speed, in search and destroy mode. His target is usually a piece of paper or a magazine that has inadvertantly fallen to the floor. And the stairs, I can't believe he's mastered the stairs. I thought I had at least a few more weeks!