When do cats stop growing?

Direct answer: Most cats reach close to adult height and length around 12 months, while large breeds may continue growing for two years or longer. Body condition, nutrition, genetics and health affect the pace.

Most cats: around 10 to 12 months

Growth is fastest early in kittenhood, then slows. Veterinary nutrition guidance notes that many kittens reach adult body size at about 40 weeks and mature around 10 to 12 months. Large breeds can continue developing for longer, sometimes to about 18 months.

Breed is only part of the answer

Genetics, sex, neuter status, nutrition and health all influence the curve. Healthy growth is not the same as maximum-speed growth: overfeeding can add body fat without making bones and muscles mature more appropriately.

Regular weights and body-condition checks are more informative than comparing one kitten with a friend’s cat of the same age.

Growing out of kitten food

Kittens need food formulated for growth. The transition to an adult diet is commonly considered at about one year or once maturity is reached, whichever is later. Ask a veterinarian when breed, body condition or a health condition makes the timing less obvious.