Owen's mobility

Owen's mobility is starting to freak me out. I was prepared for the crawling, but not the pulling up or sitting up on his own. That's just too many things going on at the same time! Next thing I know, the boy will be running after his brothers (which I suspect is his goal). He gets so upset with me, if I don't carry him into the same room his brothers are playing in. He wants to be with the boys all the time. Anyway, I caught Owen pulling himself up onto his knees to reach the fringe on our window shade on Monday. Today I turned around expecting to still see him practicing his crawling, but instead he's just sitting there looking at me with this big smile on his face. I put him back on his tummy so I could see him do it again.