Looks like you got yourself a "Teapot".
Buddy was 6.5 lbs at 14 1/2 wks today he's 16.3lbs.
I'd guess Sam will be around 16 -18lbs. He's already
almost 2lbs larger than Buddy was at that age.
The bigger ones are wonderful. You don't have to worry
so much about stepping on them. They are always underfoot
just like the smaller ones. They seem to be healthier as well.
They act just like the little one's but are just bigger.
Congratulations, you'll love the size.