Mad is a little bigger than her but when a went to get Maddie the breeder had an older pup about 5 1/2 months, from a different litter that was 1 pound 8 oz she was very tiny and full of attitude, They were holding her and not trying to find her a new home until she was old and big enough to do all of the health tests first. Tests all came back good and she just went to her forever home about 2 weeks ago. Still there are not a lot of dogs out there that that tiny, My vet works primarily with small dogs, but Mad is still the littlest one that he has had. We are hoping that she will out grow that status soon, and the thought of spaying her at this point makes me unbelievably anxious.
As for growth they all grow at their own rate my little girl really slowed down more than we expected her too(but she's not done yet

), however I have a friend who's little one went through a really good growth spurt at about 9 months she bumped up from 2 3/4 to 3 1/2 lbs, and Copper my boy went through his last growth spurt at 15 month

he out grew most of his clothes and gained another lb