Looking out over his crib...strong!

I went into get Cooper after his 2nd nap of the day, yesterday, and I could see his head and his shoulders over the crib. hmmmm... I was like.....are you standing up? He must have pulled himself up. He was at the end of the crib, his hands were hanging on the edge of the crib, holding himself up and he was I guess "standing" on his knees. My strong little boy, pulled himself up to look for mommy to come get him. He wasn't crying, he was just looking around at his room.