Hi. Welcome to Yorkie Talk! I have a 15 week old that weighs 2 lbs and I have been struggling with getting him to eat since he was 8 weeks old and I brought him home. I've tried every trick I can think of and tried every suggestion from here and other places. Some things work for a few days and then nothing again. LOL.
Baby rice cereal mixed with chicken baby food. (likes this one a lot!)
Boiled Chicken and brown rice with homemade chicken broth
Scrambled egg sprinkled with parmesan cheese
Lean scrambled hamburger
We have tried Blue Buffalo hard puppy food, soft puppy food, Cesar puppy soft food, Royal Canin #28, and one other. I leave hard food out for Louie at all times but he doesn't eat it. I use the above people food when I know he needs some calories to keep his blood sugar up. Just keeping my fingers crossed that he grows out of it because I worry all of the time and it is a lot of work to keep making him things. LOL
Good luck!