I was wondering if there were any guidelines to go by to try to figure out how big your pup will be? Holly was 3.5 oz at birth and is now 32 days old and weighs 1 lb. 1/2 oz. Her mama weighs 4 1/2 lbs. and her daddy weighs 4 lbs. The past week Holly has not been gaining much weight at all. She eats well, both from mama and also blended up puppy food. This past week she has been much more active, running around and playing with our other yorkies. She even already goes potty on her pee pad!! I was very impressed to see such a tiny, young little thing do that!