When Do Kittens Stop Growing. This is the stage when most kittens are adopted and separated from their mother. The bottom line on, “when do cats stop growing?” while kittens will stop growing at about 1 year old, it’s important to remember that most kittens will look like an adult at 6 months old.
Most cats reach their full growth between about eight months and a year old. A cat’s breed also affects its rate of growth. If you are a cat owner, you perhaps remember how sweet your cat was when it was just a small kitten.
Weigh your cat once or twice a month.
Weigh your cat once or twice a month. So, when do cats stop growing? A kitten is not considered to be a cat until it is 12 months old. They will often continue to grow past this point, but it is likely to be nowhere near at the rate they had been growing prior to being 6 months of age.