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Kittens typically reach a length and weight close to their full-grown size by 9 to 12 months of age. After the 1-year mark, most cats continue to grow at a much slower rate until at least 18 months of age. Large breeds, such as Maine coon cats, typically take even longer to grow to their full size. These cats may not be fully grown until they reach 2 to 4 years of age.
Video Transcript. Let's talk about when a cat stops growing. Generally as kittens, they grow pretty rapidly. And bone growth continues up until about 8 to 12 months of age. Now that is to say they fill out 8 to 12 months of age. Kittens need to be on a growth or kitten formula type of food, because it provides more calorie.