Jackson was 5lbs at 9 weeks old and he is now 15bs at 2 years old! He's my big boy
He followed the "double the 12 week weight" rule pretty well. He was 6lbs at 12 weeks old and it doubled to 12lbs by the time he was 7 months old and he maintained that until he gained some more muscle and weight (not he's not overweight) at 1 1/2 years old.