Her mom was 7lbs and her daddy was 4 pounds. The breeder said she had a puppy in the last litter that was about her size and she only grew to 3 pounds. My little boy was 1 pound when I got him at 6weeks and by 12 weeks he was 2pounds.... but now he is 4 and only weighs a little over 2.5/2.75 pounds. I guess there is no way to really tell..... she has gained 2 pounds in the last month though which kinda freaks me out cause I wanted them to be around the same size....