At 8 months, Si weighs 18 pounds and is around 27 inches long (I measured from home which is hard to do when he moves like he does). He has 4 teeth (2 top & 2 bottom) and wants to stand all the time. He can now pull up on his own, but still isn't very mobile. He scoots on his butt and a little on his belly, but isn't very fast at it.
He's still super happy and loves to smile.