Like most dog breeds, Goldendoodles do their fastest growing in the first 50%of their adult weight, which generally correlates to the first 6 months of life...
...but they generally reach their maximum adult weight anywhere between 1-2 years of age.
Toy Goldendoodles
How Big Do They Get and By What Age?
Toy Goldendoodles weigh between 5-15 lb. and reach their full adult weight between 7.5-11 months of age.
Adult Weight = Weight at 15 Weeks x 2
To Predict a Toy Goldendoodle's Weight, Try This Formula: