My Sophie is 5 1\2 months old and she weighs a little over 6 lbs. I was told she would weigh between 3 to 5 lbs. She is a little on the chubby side though. We have been very consistent with her feedings and the vet says she is very healthy. I have had people ask me if she is full stock and I'm sure she is. I don't see what the big deal is anyway. Once you get them you love them no matter how big or how little they are.
Sophie'smom