How much did less did the original boy weigh? I would go with my first instinct...
Funny story-when I was choosing my Gracie, I chose the largest, chubbiest pup there and she has grown to be my smallest. She weighed in at 3.4 lbs. in Sept. but I weighed her again today and she is at 3.0...
she was suppossed to be between 5-6 lbs by her baby weight. she has stayed within 3/4 lb. since she was 2 1/2 lbs. at 12 weeks, so go figure?
I still love her though...