Rex's Growth Max's Growth Number of Weeks Weight (pounds) 12 (2, 10.7) 2 11 Weight (pounds) 8 (1.8.2) (0,5.7) 3 13.5 4 4 16 2 3 Number of Weeks Rex's rate of change: Max's rate of change: Both puppies have a rate of change of 2.5 pounds per week, so grew at a faster rate. Rex weighed lb at birth. Max weighed lb at birth. weighed 0.3 lb more at birth. Site