My two are like night and day . . .I don't think it's so much a weight thing as a structure/frame thing . . .
Brody weighs 5 1/4 lbs at 2 1/2 years old and his frame is small which makes him almost a lightweight when you pick him up it honestly feels like there is nothing to him . . . His parents were 3 1/2 lb dad and 5 lb mom
Rhianna on the other hand . . .she weighs 6 1/2 pounds at 13 months old and her frame is short/stocky and she's built like a brick . . .she feels A LOT heavier than she actually is . . .my husband said if I don't cut back on her food intake she'll be a HOUSE . . .

I lovingly call her "moo" because she LOVES her food . . .

Her parents were 4 lb dad and 5 1/2 lb mom . . .
They could both be 10 lbs and I'd love them to death . . .no matter what my husband says . . .