I think the above post is right...I don't think if she weighs only 2.2 lbs now at 12 weeks she should get over 7 lbs.  My breeder told me the same thing that they should double at twelve weeks.  My puppy is still with the breeder and was exactly 2 lbs at 8 weeks.  The breeder has had several litters with this mother and most the puppys have been 5-7 lbs.  And she thought our puppy would be 6 lbs...which is what we were hoping for.
 
And like everybody else I see all yorkie.  Most of the mixes there is always something that suggest another breed, ears, nose, coat...I don't see anything that doesn't look like most yorkie puppies. 
