Kitten Growth and Development Week by Week: Milestones to Expect
Kittens change astonishingly fast. In six months, a blind, helpless newborn becomes a bouncing, climbing, nearly full-sized cat. Knowing what to expect at each stage helps you provide the right care and notice when something is wrong.
Weeks 0 to 1: newborn
Newborn kittens are born with eyes and ears closed. They weigh about three to four ounces, cannot regulate their temperature and depend on their mother for warmth, food and stimulation to eliminate. They sleep nearly all the time and nurse every couple of hours. They should gain weight daily.
Orphaned kittens need immediate help. See how to bottle-feed a kitten.
Weeks 1 to 2: eyes open
Eyes usually open between seven and ten days, and all kittens' eyes are blue at first. Ears open at about the same time. Kittens begin to crawl, and the umbilical cord falls off in the first days.
Weeks 2 to 3: first steps
Kittens begin to stand and wobble around. Baby teeth start to appear at around two to three weeks. The mother still stimulates elimination, though kittens begin to learn to eliminate on their own.
Weeks 3 to 4: exploration
Kittens walk, explore and start to play. They begin to groom themselves and may use a litter box if one is available. Hearing and vision improve. Introduce a shallow litter box. See kitten litter training.
Weeks 4 to 5: first solid food
Weaning begins. Offer a gruel of kitten food mixed with kitten formula, and gradually reduce liquid. See kitten feeding schedule. Kittens play with littermates, learning bite inhibition and social skills.
Weeks 5 to 8: social learning
Kittens become more coordinated and playful, pounce and climb. Teeth are in, and eye color begins to change. Weaning is usually complete by eight weeks. This is the key period for socialization. See how to socialize a kitten. Gentle handling by many people, exposure to household sounds and positive experiences build confident adults.
Weeks 8 to 12: vaccines and independence
Kittens usually go to new homes between eight and twelve weeks, depending on health, and ideally not before. They begin vaccines and deworming. See the cat vaccination schedule and worms in cats. Keep them indoors, and kitten-proof the home. See kitten-proofing your home.
Months 3 to 4: growth and teething
Kittens lose baby teeth and grow adult teeth, sometimes chewing everything. They may be very active, so provide toys and scratching posts. See how to play with a kitten. Adult eye color settles, and the coat matures.
Months 4 to 6: adolescence
Kittens may become bolder, test limits and approach sexual maturity. Spay and neuter timing is covered in when to spay or neuter a kitten. Large breeds, such as the Maine Coon, keep growing for years.
Weight and growth
Kittens gain steadily, roughly a few ounces per week in early months. Weigh regularly. Poor weight gain or weight loss needs vet attention.
Warning signs
Call a vet urgently if a kitten:
- Is cold, limp or weak
- Is not nursing or eating
- Has diarrhea, vomiting or breathing trouble
- Has crusty or swollen eyes
- Has pale gums
- Is losing weight or failing to gain
See the emergency warning signs guide, and use the US vet directory to find a clinic.
Behavior and development
Kittens learn through play and exploration. Provide a safe space, gentle handling and routines. Teach them not to bite hands. See how to stop a cat from biting.
Keeping a growth diary
Weigh your kitten weekly on a kitchen scale and write the number in a notebook. Add notes on appetite, play, litter use and new skills. Share the diary at vet visits. Steady growth is the best sign that a kitten is thriving, and it helps your vet catch problems early.
Breed differences
Some breeds mature faster than others. Small breeds may reach adult size by a year, while large breeds can take three to five years. The milestones above are a guide, not a strict schedule, and individual kittens vary.
Supporting each stage
At every stage, the basics are the same: warmth, good nutrition, gentle handling, a clean litter box and regular vet care. Adjust the environment as the kitten grows, with more space, more climbing options and more play. A well-supported kitten develops physically and emotionally, and early good care sets up a healthy adult cat.
When to ask for help
If a kitten misses milestones, such as eyes not opening by two weeks, not walking by five weeks or failing to eat solid food by eight weeks, ask your vet. Early advice makes a difference.
Sleep
Kittens sleep a lot, often sixteen to twenty hours a day. See why do cats sleep so much.
Frequently asked questions
When do kittens open their eyes?
Usually between seven and ten days, though it can take up to two weeks.
When can kittens eat solid food?
Around four weeks, with weaning gradually complete by eight weeks.
When can a kitten leave its mother?
Typically at twelve weeks, or at least eight, depending on health, socialization and guidance from a vet.
How much should a kitten weigh?
Kittens gain roughly a few ounces per week. Ask your vet to check growth.
Sources and further reading
We link to recognised organizations so you can check the basics for yourself. We have no commercial relationship with any site listed here.
- American Veterinary Medical Association: pet owner resourcesPolicy-level guidance from the national veterinary association.
- WSAVA Global GuidelinesGlobal vaccination, nutrition and pain guidelines for small-animal vets.
- Cornell Feline Health CenterFeline health information from Cornell University's College of Veterinary Medicine.
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