I think Kimberly's chart is a great estimate/average.
According to it (and every other method of trying to figure out how much he would weigh as as adult) he should be about 5.75 pounds. He's 9lbs. I think this just goes to show that it's hard to estimate weights/averages for living things.
According to some test my parents heard about and did when I was a baby - measuring me at 2 and a half years old and then doubling it, I was supposed to be 6 ft tall full grown. I'm 5'4
