I have a little one too. She is 16 weeks and weighs 1.7lbs. I was scared to death at first. But she is awesome. We laugh at her all the time at the crazy things she does.
I wanted a yorkie that would be around 5 pounds or so. Of course when I picked her from the litter I picked the one that was very small. But her face so sweet. The vet said she would be around 3.5 lbs full grown. I will be just fine with that.