Portrait Of Cat On Field

A kitten is born, its eyes and ears open, it gets teeth, and then weans from nursing to eating solid kitten food. There are a lot of changes that happen in just the first couple of months of a kitten’s life. But the next few months are also full of changes and new experiences for a growing kitten.

Physical Development

  • At three months of age, a kitten will have developed all of its baby teeth and they will even begin falling out. If the teeth do not fall out by the time the kitten is about six months of age, a veterinarian may recommend they be extracted when the kitten gets spayed or neutered. Baby teeth that don’t fall out are called retained deciduous teeth and they can cause problems for the adult teeth if they don’t fall out or get extracted in time. A typical cat will have 26 baby teeth and 30 adult teeth so there is a lot of teething going on for a few months. You may find baby teeth lying around the house but most of the time the kitten swallows the teeth.
  • By three months of age, a kitten’s eyes will also be their adult color. The baby blue eyes will have changed to a permanent adult eye color unless the cat has the genes to permanently have blue eyes.
  • Between three and six months of age, a kitten’s body shape will start to fill out. This means a kitten will start to get more muscular and evolve from a round-bellied baby to a lean and slender young adult.

Behavior Changes

  • Kittens sleep a lot when they are first born, but as they grow they will spend a little less time sleeping and more time playing and exploring. From the ages of three to six months, a kitten is just brave enough to test its physical limits, put different items in its mouth, and approach other animals to see what happens. The first few months of socialization with its littermates and mother will pay off during these next three months as you will start to see a kitten’s personality develop. If it did not receive appropriate socialization, it may begin to develop aggression issues with toys or food..
  • Teething is normal behavior for kittens of this age. Chewing on furniture, toys, and even some items a kitten shouldn’t chew on is an attempt to help the baby teeth fall out as the adult teeth are coming in. This behavior should be allowed but restricted to safe toys. Kitten-proofing a home is often necessary to keep a kitten safe from items like electrical cords, but also to keep your belongings safe from tiny, yet damaging, kitten teeth and nails.
  • Most kittens are sexually mature by the time they are about six months of age, but this can vary from cat to cat with some breeds developing more slowly or more quickly. Once a cat reaches sexual maturity, it may start to act differently due to the hormones that are now circulating within its body. Female kittens may go into a heat cycle and demonstrate behaviors such as crying and holding their tail up in the air while male kittens may become more aggressive. Surgery to spay or neuter a kitten will eliminate the behaviors caused by the hormones circulating throughout its body.

Health and Care

  • A kitten should have already had its first vet visit and received its first FVRCP vaccination at about two months of age, but that isn’t all a growing kitten will need. Three to four weeks after the first vaccination, or at about three months of age, the second FVRCP vaccination is administered. About one month later, the last FVRCP vaccination is administered along with a rabies vaccination. During these three months, your veterinarian may also discuss other vaccination options with you depending on your kitten’s lifestyle and exposure risks. The first year the vaccinations are received is the only year they will need to receive boosters to be effective. These vaccinations are incredibly important to help keep your kitten healthy, and the rabies vaccination is even required by law, even for indoor-only cats.
  • Spaying and neutering are very common surgical procedures, and by six months of age, most kittens are having one of these procedures done. Females get spayed and males get neutered, but both surgeries are removing the reproductive organs in a kitten. With these organs removed, less sexual hormones are being produced, a cat is unable to reproduce, and the risk of many types of cancer are eliminated or greatly lowered. Your veterinarian will recommend the best time to spay or neuter your kitten and may also recommend pre-operative blood screening be performed before the surgery. This blood screening will not only show whether or not your kitten is healthy enough for anesthesia, but it will also establish baseline normal values for your kitten. These baseline values will be useful to compare future blood work to as your cat ages.
  • Parasite prevention is important to start on kittens as soon as they are old enough or weigh enough to receive it. Talk to your veterinarian about parasite prevention options for intestinal parasites, fleas, ticks, and heartworms at the first vet visit. These medications are often given to a kitten monthly, but some are needed less frequently.

Food and Nutrition

Kittens between the ages of three and six months should be eating an AAFCO-approved, formulated kitten food to receive all of their nutritional requirements. They will continue to eat this food until they are about nine to twelve months old. As a kitten approaches six months of age, you may have to regulate how much you feed it if it is gaining too much weight. Every kitten food has a different amount of calories per cup of food, so you will need to follow the feeding guidelines on the bag or can or work with your veterinarian to determine how much food your specific kitten needs. The average kitten usually needs about 1/2 cup of an average dry kitten food a day.


The period between three and six months of age is important for training a kitten on where it can and cannot go in the house, what items are acceptable to play with and even teaching it its name. Treats, verbal praise, and petting should be used to reinforce good behaviors.

Litter box training should come naturally to a kitten but there are special litters designed to attract kittens if you are concerned about it not knowing where to potty. Make sure your kitten can get in and out of the litter box and knows where to find all of the boxes in the house. If you have one kitten you should have at least two litter boxes in separate locations, ideally on each floor of a multi-level home.

Article Sources

The Spruce Pets uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.

  1. 2021 AAHA/AAFP Feline Vaccination Guidelines. American Animal Hospital Association, American Association of Feline Practitioners, and International Society of Feline Medicine.

  2. Spaying and Neutering. Merck Veterinary Manual.

  3. Kitten Care. Merck Veterinary Manual.

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