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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.
Rarely will a young kitten sleep at the foot of your bed. Furthermore, kittens grow quickly, becoming nearly full size by six months of age but often continuing kitten behaviors for much longer. An adult cat, however, is generally much calmer and less likely to get into trouble.