Dax is officially 9 months old (and a few days). Yesterday he had his "Well Baby" check with the pediatrician. Dax is 28" long (just under 50th percentile), and 16 lbs 14.5oz (4th percentile). So, definitely skinny, but the doctor said not to worry about it - he's still gaining weight ok. He's in constant motion, so I'm sure he just burns up any calories. Here's a video of him practicing walking with Dad. It was taken a few days ago and he's already improved since then. It shouldn't be too much longer before he's off and running.