Nathan stood up for himself for the first time yesterday!
He's been working his way up to it for a while. He'll play with toys on the floor, then push up to a legs-extended crawling position reminiscent of Mowgli in the Jungle Book. Yesterday he pushed himself up to a standing position, legs spread wide enough that we could slide a small dog under him, and arms wavering back and forth in mid-air to maintain his balance.
He's been practicing his new skill regularly ever since. He gets such an excited and pleased grin when he succeeds. It's "I never knew I could be this tall!" crossing over into "I can see my house from here!"
Ten months old. I'm sure walking isn't far behind...