When I got Baby they said she'd be around 4lbs. I really didn't care, but when I brought her to the vet, at around 3 months, he said she'd be more like 8lbs. Well, she's about that now (if not more). She gained weight after being spayed. Anyhoo, if you bring your furbaby to the vet, he/she might be able to give you the best estimate. But, no matter what size, I know you will love your baby! I know you got "tricked" with the whole 'gotta pay more for a T-cup,' but, now you know for next time when you get this furbaby another Yorkie playmate!