I adopted my girl when she was 10 weeks old (so I was told). No papers or records. Not sure if she's even all Yorkie or not. She had a medical condition which was too costly for the "breeder" to bother fixing..ARGH..well, anyway thats how I came to get this little beauty. I took her right to my vet and at 10 weeks (my vet said that she looked pretty close to that, in her opinion) she weighed 3.10. On Wedensday she weighed exactly 6 lbs. So, I guess at 14 1/2 weeks she's a pretty big girl from what I'm reading. Still feels very tiny to me