My Baron came from a 3.5 lb. female and a 4 lb. Male. She had 5- 2 oz. male babies and they range from 4lbs. to 8 lbs. in size. Baron is 7.3 lbs. But, he still worries me when he hurts himself! He still sleeps on the bed with everyone else, Just in a soft crate, I'm afraid he'll fall off the bed and break something!! He was 5 pounds at 6 months when I got him and since he was on Steroids for Pancreatitis is built like a little chubby tank, But, He's so clumsy....Good-Luck in your search for a sturdier Yorkie....