Hi here is some info that all buyers of yorkies , should know when you buy a new puppy at 5 to 6 weeks of age you dont know what is going to change with a puppy. First of all it could look fine and healthy but as it grows things change you could end up with a Dog with a OVER BIT or UNDER BIT it wont show up until that dog is about 3 to 4 Mos old. I have one of this Puppys i got her when she was 8 weeks old and the vet checked her from head to toe and she was fine but now that she is 6mos old she has a under bit I cant breed, Her hair is short cute but not what i was wanting her to look like she was a Teacup when she was a baby and that is what i was told, But she is 7 to 8 pounds. What i'm trying to say is if you buy a older puppy you will know what could be wrong with you new baby. If a yorkie is 4 to 5mos old you will also know what size you baby is going to be. just something everyone should know and things that breeders dont tell you .