Hootie is 2.5 lbs at 5 months old and Hobbs is 3.5 lbs at 1 year old. It seems that Hootie has reached a plateau, but I hope she gaines a least another pound before she stops growing. I call her my little hamster.
I've always heard that they stop growing around 6 months of age. They may get a little "fatter" after 6 months, but I don't think they'll get "taller."