Welcome to YT.
Recently there have been quite a few new babies that have not wanted to eat. Eating is really important for yorkies, because of hypoglocemia.
There is alot of great information here on YT that can help you. The search tool is fantasctic.
The thread below was started for new people, it has alot of great information. Just click on the link and it will take you there.
http://www.yorkietalk.com/forums/sho...ighlight=amber