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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.
1 The first teeth to grow in a kitten are the incisors (around 2-4 weeks) and canines (around 3-4 weeks), followed by the premolars (around 4-6 weeks). 2  A cat younger than around four months will not yet have its molars. 3  From the ages of around six months up to one year, your cat will have all of its adult teeth.