I am currently owned by 3 yorkies. Annie is the only one that is full grown at 2 years old. She weighs 4 pounds 7 ounces. She is the only one I know for sure what the full grown weight is so she is the one I used to answer the poll question. Cody is 5 months old and weighs 3 pounds 6 ounces and Emmie is just 2 pounds 6 ounces at 5 months. I think Cody will top out between 4 and 4 1/2 pounds and Emmie might make it to 3 1/2. Annie stayed right at 4 pounds until she was about 18 months old and added the extra ounces between 1 1/2 and 2 years. I think she is done now!