When do cats stop growing?

HotbotBy HotBotUpdated: June 21, 2024

Understanding the Growth Phases of Cats

Cats, much like humans, go through various growth phases from the moment they are born until they reach their full size. Understanding these phases is crucial for cat owners as it can help in providing the right nutrition, exercise, and care at different stages of their life.

Neonatal Phase (0-2 Weeks)

During the neonatal phase, kittens are completely dependent on their mother. They are born blind and deaf, and their sense of smell is the only guide they have. Growth during this phase is rapid, and kittens can double their birth weight within the first week. Proper nutrition from the mother’s milk is essential for this rapid growth and development.

Transitional Phase (2-3 Weeks)

In the transitional phase, kittens begin to open their eyes and develop their sense of hearing. Their coordination starts to improve, and they become more mobile. The growth rate continues to be significant, and by the end of this phase, kittens begin to explore their environment, albeit clumsily.

Socialization Phase (3-8 Weeks)

The socialization phase is critical for a kitten's overall development. During this period, they start to interact with their littermates, mother, and humans. This is also the phase where they begin to wean off their mother’s milk and start eating solid food. Growth remains steady, and their physical and social skills develop rapidly.

Juvenile Phase (8 Weeks-6 Months)

The juvenile phase is marked by significant growth spurts. Kittens gain muscle mass, and their bone structure solidifies. By six months, most kittens are about half of their adult size. This phase also includes the onset of sexual maturity, which can vary widely depending on the breed and individual cat. Neutering or spaying is often recommended during this phase to prevent unwanted behaviors and health issues.

Adolescent Phase (6-12 Months)

Adolescence in cats is similar to that in humans: it’s a period of both physical and behavioral changes. Growth slows down compared to the juvenile phase but continues steadily. By the end of this phase, most cats have reached about 80-90% of their full adult size. Behavioral changes such as increased independence and sometimes rebellious behavior can be observed.

When Do Cats Reach Their Full Size?

The age at which cats stop growing can vary depending on several factors, including breed, genetics, and overall health. On average, most domestic cats reach their full size by 12-18 months. However, some larger breeds like Maine Coons can continue to grow until they are 3-4 years old.

Factors Influencing Growth


The breed of a cat plays a significant role in determining when they will stop growing. Smaller breeds like the Siamese or Singapura may reach their full size quicker, often by 12 months. Larger breeds like the Maine Coon or Ragdoll can continue growing well into their third or fourth year.


Genetics also influence a cat’s growth rate. If a kitten’s parents were large, chances are the kitten will grow to be large as well. Conversely, smaller parents typically produce smaller offspring.


Proper nutrition is essential for healthy growth. Kittens require a diet rich in proteins, fats, and essential vitamins and minerals to support their rapid growth. Poor nutrition can stunt growth and lead to health issues.


Health conditions can also impact a cat’s growth. Parasites, infections, and chronic illnesses can hinder proper development. Regular veterinary check-ups and vaccinations are crucial to ensure a kitten grows into a healthy adult cat.

Signs That a Cat Has Stopped Growing

Stable Weight

One of the most obvious signs that a cat has stopped growing is a stable weight. Once a cat reaches its full adult size, its weight will plateau. Regular monitoring of your cat's weight can help you determine if they have stopped growing.

Behavioral Changes

As cats reach adulthood, their behavior often becomes more predictable and stable. They may become less playful and more interested in lounging and observing their surroundings.

Physical Development

A fully grown cat will have a well-developed musculature and bone structure. Their size, including length and height, will no longer increase, although they may still fill out and gain muscle mass.

Cats go through various growth phases from birth until they reach their full size. Understanding these phases and the factors that influence growth can help cat owners provide the best care for their feline companions. From the rapid growth in the neonatal phase to the steady development during adolescence, each stage is crucial for the overall health and well-being of a cat.

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