I don't have a picture at the moment to share but will try to take some tomorrow evening to show you size differences. Bella is 2lbs 10 oz (might be a little more now, I have to weigh her) at 21 weeks old. She is very small IMO and I hope that we can get her up to at least 4lbs full grown. I was chuckling a bit cause my cat is WAY bigger then her, i'll have to take a picture of the 2 next to each other. She is smaller then my labs heads. 
