I have 2...Daizy is now 6 lbs....at a year old and Tulip is 4 1/2 months old and weighs 1 lb 8 oz.. She's as healthy as a horse...but we do have to worry about where she is ALOT...She's a blast to take places however...and people just ooh and aww over her.
So I have one of each. My daughter has an 8 lb yorkie and she's still nice and small. There is no guarantee when you get your yorkie what their weight will be...but you'll love them no matter how big or small they are.