When Do Cats Stop Growing?

March 16, 2021

kitten in grassWhen you first lay eyes on your kitten, it almost seems impossible to imagine that something so tiny and meek will one day grow into a beautiful, majestic cat. That same little furball with the huge blue eyes who can barely walk will one day be powerfully jumping into the air with pure terror at the sight of cucumbers. Nature really is a miracle.

But exactly how long is the timeframe between your kitten being so small it can fit in the palm of your hand and it being a fully grown cat? Should you expect a gradual shift from kitten to cat? Or will it be like with humans, where they go from small children to getting their driver’s license in the blink of an eye?

What Age Do Cats Stop Growing?

cute kittenAccording to veterinarians, most cats will usually be considered at or near their full size by the time they reach one year of age. However, some larger breeds will continue to grow for months afterwards. In fact, some of the largest cat breeds like the Maine Coon have been reported to grow all the way up until they’re four years old!

While the exact date of maturity varies slightly by breed, your little furball will likely turn from being a kitten into a cat between ten months and eighteen months old. With that in mind, you may be sitting next to a kitten as you read this and wondering: “This looks like a cat to me, and I know Whiskers isn’t older than six months! What gives?” While your kitten might have the physical characteristics of a mature cat, it’s important that we review the milestones that kittens pass as they transition from kittenhood into…. Well, cathood!

From Months Three to Six

During this pivotal time in your feline friend’s life, a lot is going to change. They’ll begin sprouting ferociously sharp baby teeth around this time. Those teeth will start to fall out, too, so make sure the “Tooth Fairy” has some small treats for your buddy. Their eyes will change color too, shifting from a precious, baby blue color to its adult color. Your kitten’s petite frame will also begin to fill out during this time, meaning they’ll start packing on muscle and the adorable baby fat adorning their belly will likely slim out.

Month Six

kitten playingBy six months old, your once youthful kitten will likely look more and more like their adult selves. However, this doesn’t mean they’ve reached full size. As a general rule, remember that an average-sized cat will gain one pound per month while they’re maturing. So, by six months old, your cat should weigh roughly six pounds and look like they could use a bowl or two more of food. Your cat’s body proportions may even look a bit wonky around this time, but don’t worry, they’ll easily grow into their bodies with time.

Month Seven

Raising your seven-month-old kitten may feel reminiscent of raising a teenager: your cat will be simultaneously excited to explore everything but oh so sleepy. As your cat works his way through his seventh month, expect him to take lots of naps. With a larger body to match their budding confidence, seven-month-old cats will also begin demonstrating how social they want to be, both with you and other animals in your household.

Months Eight and Nine

toyger kittyAt this stage, your cat is likely nearly done growing. Notice we said nearly. Having taken the awkward first few steps towards pronouncing their personalities, your cat’s confidence will likely be at an all-time high. During this time, their paw-eye coordination will strengthen considerably, as will the muscles in their hind-legs. With this in mind, it’s important to make sure that you clear your counters (and any other high spaces, really) of materials that could be hazardous or, non-replaceable, if they were knocked off.

From Months Ten through Twelve

It’s between months ten through twelve that the average cat will reach their full adult heights and lengths. Additionally, your cat’s personality (while by no means paused forever) will likely conclude developing in these three months. This is also the time that your cat will likely have achieved sexual maturity, although we recommend getting your cat spayed or neutered well before this point. Perhaps most importantly, this is the period of time when your kitten will make the full transition from eating kitten food to eating regular cat food. After all, we are what we eat, right?

So, that’s it. Start to finish, nine months is about all it takes for the average kitten to evolve from a tiny fur ball into the slinky, loveable critters we know and love. Now, the above timeline is by no means a hard-and-fast schedule. How fast your cat grows (and how big they grow to be) can be affected by a variety of factors.

What Factors Affect How Fast Cats Grow?


siamese catIt may be surprising to learn that, unlike humans, male cats actually grow more slowly than their female counterparts. This is because female cats tend to have smaller frames than male cats of the same breed, meaning they have less of a body to grow into. According to the Merck Veterinary Manual, the average domestic male cat weighs approximately seven pounds, whereas female cats weigh approximately six pounds. Using this same manual, it’s found that male cats tend to be around 21 inches long while female cats are slightly shorter at 19 inches long.

Spaying or Neutering

It has long been a subject of discussion as to whether or not spaying or neutering your point-eared friend stymies or stunts their growth in some way. More specifically, it was believed that spayed and neutered cats grew larger than their unaltered counterparts. Studies have, in fact, borne this theory out to a degree. It can now be safely said that, so long as the procedure is performed before the cat reaches adulthood, their girth and length will be larger than their virile counterparts. This is because pediatric spaying and neutering results in a protracted fusion of a cat’s growth plates around their legs and arms, thus giving them more time to grow.


Of all the items on this list, this is by far the most important.

Once a kitten is weaned off milk at around two months old, they become solely reliant on their owners for nutrition. With such a heavy weight placed on your shoulders, it’s necessary to keep in mind the goals of proper kitten nutrition.

A proper diet ensures that your purry pal grows at just the right rate – not too fast, not too slowly. You want to avoid a diet that precipitates maximal growth at all costs, as this can lead to feline obesity. While the type of food you feed your kitten is undoubtedly important, you should also consider how much food you’re feeding them and how often you’re doing it.

cat in foodFrom months two to three, kittens should be fed small meals at least four times per day. This is because their tiny stomachs can’t store the amount of food needed for proper nutrition. As they progress from three months old to six months old, you should be feeding them between ⅓ and 1 cup, volume-wise, of food at least three times per day.

Some veterinarians even recommend a practice known as “free-feeding” for kittens who are between three and six months old. Free-feeding is exactly what it sounds like: you leave food out for kittens to eat throughout the day. Regardless of whether you choose a meal-based schedule or a free-feeding style, you should be weighing your cat every week at this stage of life and consulting with your veterinarian about whether or not adjusting their food intake is necessary to maintain a healthy weight.

From months six through twelve, your cat should be eating twice per day at roughly the same time each day (cats purr-fer a routine). During this period, follow recommendations from food labels and your veterinarian to determine the amount you should feed them.

However, be warned that these dietary guidelines change drastically if you neuter or spay your kitten. In general, it’s believed that removing a cat’s reproductive tract can reduce their daily caloric needs by up to 30%. The reasons for this are still being studied, but two theories have gained prominence. The first is that the process of neutering and spaying lowers a cat’s activity levels so substantially that they need to take in less food in order to account for the lack of additional calories being burned. The second is that the process of spaying and neutering alters the hormones in a cat’s bodies responsible for regulating their metabolism. Regardless of the reason why, the science is clear: if you spay or neuter your cat, give them less food during each feeding.

Now that we’ve discussed the questions of “How much?” and “How often?”, we can begin talking about the components of a proper diet for growing kittens. When crafting a diet for your kitten, there are three main nutritional components that you have to solve for: fat, protein, and calcium.

One thing to note is that, unlike dogs and humans, cats are obligate carnivores. As such, they have much higher minimum protein requirements than dogs (33g versus 21g per 100g of dry matter). That’s why kittens require that at minimum 35% and up to 50% of their dry food be composed of protein, with at least 9% of dry food coming from an animal source. The necessary amount may be higher when the kitten is weaning off milk, but, rest assured that the amount of protein they’ll need will decrease as they continue aging.

While we might try to avoid foods that are rich in fat, kittens actually need a fair bit of fat in their diet. Fats are loaded with essential fatty acids and fat-soluble vitamins that are crucial for your cat to be in good health. Generally speaking, the fat content of your kitten’s food should be between 18% and 35% on a dry matter basis.

cat eating foodAnother critical mineral for your kitten’s healthy development is calcium. As specified by the trade body representing the European pet food industry, a complete diet for your cat should provide 2.5g of calcium per 1000 kilocalories of food. Do not overshoot or undershoot this nutritional requirement. A study of cats who were fed a diet lacking calcium demonstrated cats that grew to develop soft-tissue calcification which led to breathing difficulties, lethargy, and stunted growth as a result of vitamin D toxicity. Meanwhile, cats who were fed too much calcium developed hypercalcaemia, which resulted in calcium deposits building in their kidneys.

In order to guarantee that your kitten gets all of these essential nutrients, we recommend following the advice of most veterinarians and getting your kitten specially formulated kitten food. More specifically, we recommend following the advice of Mindy Bough, Senior Director of Client Services for the Midwest Office of the ASPCA, stating “Don’t go with generic or store brands. Buy from a reputable company. Research has shown these kitten foods provide excellent health.”

A quality kitten food, Bough says, will have a label that specifies that it meets the nutritional requirements for kittens as established by the American Association of Feed Controls. Better yet, look out for the “Complete and balanced nutrition” label; this label signifies that any kitten eating this food will need no mineral or vitamin supplementation in order to grow healthily.

So, let’s say it’s been a year since you picked up Ole Whiskers. Well, she’s now a year old, so, it’s probably Young Whiskers. Regardless, let’s say it’s been a year and you still have moments where you can swear she looks like she’s getting bigger. How exactly are you supposed to tell when she’s done growing?

How to Tell When Your Cat is Finished Growing

cat licking lipsWhile we’ve already discussed the fact that cats can indeed continue to grow after one year, it’s important to remember that their growth will slow down significantly. However, it’s natural to wonder whether or not your kitten is done blossoming into a beautiful cat! So, if you ever catch yourself just itching to know whether or not your paw-fect pal is done growing, use the tools at your disposal and measure them! For real! It’s that simple.

Just measure their length and take their weight every month for three to six months after they hit one year old. At some point, the ever-minutely-increasing measurements are likely to stop. Once they do, you’ll know for sure that you’ve got one whole cat in front of you!

We understand the want to monitor your cat’s development and check up on them constantly. So, when we check on our fur babies and find that they’re developing a skin infection or a yeast infection, we reach for Banixx Pet Care! This antimicrobial spray provides instant sting-free, odorless relief from a variety of fungal and bacterial maladies, all without relying on steroids or antibiotics. Just identify the afflicted area, apply Banixx a few times per day, and wait for your pet’s symptoms to begin waning. Relief really can be that simple.

Almost as simple as we make learning about how to keep your pet happy and healthy! We hope you found this article helpful and if your cat ever gets any cuts, abrasions, ear infections or ringworm, we hope you keep Banixx Pet Care in mind.


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