Yes, 7 lbs is w/in standard. I was referring to backyard breeders & how they carelessly breed w/out the knowledge of the pedigree. From what little I know, the female determines how many pups will be in a litter. The determining factor of the size really depends on the lineage. There's also the occasional 'throw-backs' where a 7 lb stud can produce 3 lb (when full grown) babies & vise versa.
I saw the pic that was posted w/the ad & truthfully, he looks like an average yorkie, but shouldn't be used as a 'stud'.
Forgot to add that the male determines the sex of the pups...from what little I know.