The rule of thumb for kittens is that the average young kitten should weigh 1 pound for each month of life. So a 3 month (12 week old) should weigh at least 3 pounds. But you can tell more about the kitty’s weight by looking carefully at him. If his shoulder bones, backbone, and hip bones are easily seen, he is underweight. You cannot go by the belly, because an emaciated animal often has a big belly. Unlike what others have recommended here, I recommend feeding a small kitten 4 meals of canned kitten food per day and leaving out some dry kitten food for overnight or anytime you are not going to be around for over 3 hours

Your kitten’s weight and growth is important for their wellbeing, so it’s a good idea to track how much they’re progressing. The best way to keep track of your kitten is to weigh them regularly so that you can distinguish between healthy increases in weight and any worrying losses which could be a sign of an underlying issue.

A kitten weight chart or growth chart is an important tool to help gauge proper kitten development. With or without their mother cat, a kitten should grow steadily, at certain rates, and a variety of changes should occur within a certain time frame. The biggest indicator that a kitten is developing properly starts with weight gain, according to a kitten weight chart.

How fast does a Kitten grow?

Growing kittens under 6 months of age will weigh approximately their age in months. So, a 2-month-old kitten should weigh approximately 2 pounds, a 3-month-old kitten should average 3 pounds, and so on.

Don’t worry if your young kitten doesn’t follow this weight formula exactly, though. Each pet is unique. As long as your kitty has a clean bill of health from your veterinarian, your pet is on the right track. 

A kitten’s weight at 6 months of age and older is more variable between individual cats, since they are starting to get closer to their adult size and may grow at different rates.

Can You Tell How Big A Kitten Will Get?

Unlike dogs that can vary in size from Chihuahuas to Great Danes, cats don’t have huge variations in size between breeds. Still, though, there is some variation. Some cats can be more than twice as big as others, depending on their genetics and other factors. An average adult cat weighs 10 pounds, but some petite cats can weigh closer to 5 or 6 pounds and other equally as healthy cats can tip the scales at over 25 pounds. 

Get to know what’s normal for your unique pet. That way you’ll notice if your cat is gaining or losing weight.

What If My Kitten Is Losing Weight?

It’s always best to err on the side of caution and talk to your vet — especially if an underweight kitten also has symptoms of illness.

Kittens are still growing, meaning their immune systems are not fully developed and they’re much more susceptible than adults to parasites, viruses, and other infections (this is why it’s important to vaccinate your cat). Plus, they can become ill very quickly so it’s best to check with your vet ASAP.

Can Kittens Be Overweight?

Yes, this is possible. Common causes include overfeeding, overindulgence in treats or table scraps, a sedentary lifestyle, or changes in weight after a spay or neuter surgery.

Being overweight as a youngster often translates to obesity in adulthood, and all of the associated health risks like arthritis, diabetes, or heart and lung conditions.

If you feel your kitten may be overweight, don’t restrict their food right away. Instead, talk to your vet about the best weight management plan for your fur baby, and schedule frequent weight check-ins.

When To Weigh A 3-Month-Old Kitten?

We suggest that you should weigh your kitten in the following circumstances:

  • If it’s having a major growth spurt and goes through a significant change in size or weight
  • If you think something is wrong with your kitten.

How To Weigh A 3-Month-Old Kitten?

Your 3-month old kitten should be weighed on a flat surface. If you have a baby, you can use his scale to weigh your kitten. You can use a small digital scale to weigh your kittens such as a kitchen scale. In both cases, remember to disinfect the scale before and after use!

How Much Should A 3-Month-Old Kitten Weigh?

As a general rule of thumb, growing kittens under 6 months of age will weigh almost their age in months. So,

  • A 2-month-old kitten generally weighs between 1.4 and 2.6 pounds. They have an average weight of 2 pounds.
  • A 3-month-old kitten is expected to weigh between 2.2 and 4 pounds. They weigh approximately 3 pounds as a median.
  • A 4-month-old kitten should average 4 pounds, and so on.

The average weight of your 3-month-old kitten is around 900 g – 1300 g. This is generally the age where kittens wean from breastfeeding. So, you will no longer be feeding them every couple of hours.

How Often Should A 3 Month Old Kitten Be Weighed?

Before the age of 3 months, the weight of a kitten must be followed very closely (see how to take care of a 2 month old kitten?). The frequency of weighings between 1 and 3 months must be once a week. By noting the results to make a growth curve, we can check that the kitten is gaining weight regularly and especially that it does not lose any!

From the age of 3 months, the weighing frequency changes to Once every two weeks, which will be enough to properly control the evolution of the kitten’s weight.

When Do Kittens Stop Growing?

There isn’t really any hard and fast scientific evidence to prove at what age do cats stop growing. Different feline breeds grow at different rates, and some breeds are quite petite at maturity. Others can be surprisingly robust in size and never seem to stop growing.

Most cat breeders agree that kittens stop growing somewhere between 8 and 16 months, depending upon the breed. That’s a pretty good rule of thumb for the vast majority of cats. However, it can be a bit more complicated than that. As we all know, cats are naturally contrary creatures and nothing is that simple!

Does Breed Affect Cat Growth

For some breeds, growth towards maturity happens much more slowly or more quickly! We’ll learn more about these later. In some cases, your cat may not stop growing until she reaches 18 months.

But, for other breeds, how old are cats when they stop growing may take up to three or even five years. As we mentioned before, these figures are only guides and cat growth can be very complex!

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