When Do Cats Reach Their Full Size

Kittens experience their fastest growth spurt between birth and 6 months of age, doubling their birth weight by around 3-4 months old.


From 6 to 18 months old, cat growth slows down but they still rapidly gain weight and size during adolescence.


Most cats reach their full skeletal size by 18 months old but may continue filling out and increasing muscle mass up to age 2.

Filling Out 

Larger cat breeds like Maine Coons can take up to 4 years to reach their full size potential compared to smaller breeds.


Neutering before 6 months of age typically results in cats being slightly smaller than those neutered later or not at all.


Genetics play a big role in overall cat size and growth rate, with purebred cats tending to be more uniform.


Proper nutrition supports optimal growth in kittens and adolescents whereas malnutrition can stunt full growth potential.


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