Bella was only 8wks when we got her and she weighed 1.2 she is now 22 wks (tomorrow) and weighs 2.75 it seems she has gotten there rather slowly and has actually been 2.75 for at least a month now. I was very worried about her size and age when she first came home so watched to make sure she was eating. She didn't do great on dry kibble at first, I was giving her puppy ceasar (breeder had too) and then switched that to a better wet food slowly. If I felt like she wasn't eating I would give her cottage cheese, baby food meat sticks or veggies in the baby food jars. I would also give her some nutrical a couple times a day in those first weeks. I don't know if she needed all that but it sure did make me feel better. She has never had any episodes of hypo and has been a very healthy but little girl. I think alot of times they are stronger then we give them credit for.
BTW, she will be getting spayed in January or so... i'm so scared