Kitten Milestones Month by Month: Growth, Play, Teeth and Behavior
A kitten changes almost daily at first, then month by month as it matures. This guide gives an overview of what to expect, and what you should be doing at each stage. For a closer look at the first weeks, see kitten growth and development week by week.
Month 0 to 1: Newborn and early weeks
- Birth: 3 to 4 ounces, eyes and ears closed.
- 1 to 2 weeks: eyes open, blue at first. Crawls. Needs mother's milk or formula, and help staying warm. See how to bottle feed a kitten.
- 2 to 3 weeks: ears open, begins to stand and wobble. Baby teeth appear.
- 3 to 4 weeks: walks, plays, begins to use a litter box. Starts to explore solid food.
Orphans need stimulation to eliminate. See how to stimulate a kitten to pee and poop.
Month 2: Weaning and socialization
- 4 to 8 weeks: weaning, play with littermates, learning bite inhibition and social skills. See how to wean kittens.
- 6 to 8 weeks: first vaccines and deworming. See kitten vaccine schedule and core shots.
- Weight about 1.5 to 2 pounds.
- Many kittens go to new homes at eight to twelve weeks.
This is the key window for socialization. See how to socialize a kitten.
Month 3: Exploration
- Energetic, curious and playful. Climbing, pouncing and hunting games.
- Weight about 2.5 to 3.5 pounds.
- Second and third vaccines. See kitten first vet visit.
- Continue socialization to people, sounds, surfaces and handling.
- Litter habits should be established. See kitten litter training.
- Teething starts. See kitten teething.
Month 4: Teething and learning
- Baby teeth begin to fall out.
- Weight about 3.5 to 5 pounds.
- Training window for scratching posts, play manners and carriers. See kitten scratching training.
- Rabies vaccine and final boosters.
- Eyes settle into their adult color over the next months. See kitten eye color and coat changes.
Month 5 and 6: Adolescence begins
- Weight about 5 to 8 pounds.
- Adult teeth are mostly in place.
- Spay or neuter, usually around four to six months. See when to spay or neuter a kitten.
- Hormones begin, and some females may come into heat. See kitten first heat cycle.
- Testing boundaries, more independence, sometimes more mischief.
Months 7 to 9: Teenage phase
- Growth slows, but body continues to fill out.
- High energy, with climbing, scratching and zoomies. See kitten zoomies at night.
- Appetite remains strong, and weight gain accelerates after neutering. See feeding a neutered or spayed cat.
- Continue training and boundaries.
Months 10 to 12: Young adult
- Close to adult size and weight, though large breeds keep growing.
- Switch to adult food around twelve months, as your vet advises. See kitten feeding amounts by age.
- One-year vet visit with boosters.
- Settling into adult personality, though playfulness lasts.
Large breeds
Maine Coons, Ragdolls and Norwegian Forest Cats mature slowly, taking three to four years to reach full size. See maine coon and ragdoll.
Your monthly checklist
- Weigh and record. See kitten weight chart.
- Review vaccines, deworming and parasite prevention.
- Trim nails, check ears and teeth.
- Introduce new experiences.
- Schedule spay or neuter.
- Update your photos.
What is not normal
Contact your vet if your kitten is not gaining weight, is lethargic, has persistent diarrhea, sneezing, eye discharge, trouble walking or does not eat. See kitten not eating.
Enjoy it
Kittenhood goes quickly. Take photos, play every day and savor the change.
Behavior across the year
In the first two months, kittens learn from their mother and siblings: how to play, how hard to bite and how to groom. In months two to four, they absorb information about people, sounds and places, which sets the tone for adult confidence. In months four to eight, adolescent energy and independence appear, with testing of limits, climbing and sometimes new fears. After eight months, personality settles, though playfulness continues. Giving steady, patient guidance through each phase pays off for the next fifteen years.
Photo and record keeping
Keep a simple growth log: date, weight, vaccines, vet visit notes and funny moments. It becomes a precious keepsake, and a useful health record.
When to see a vet
See a vet at each stage for checks and vaccines. Use the US vet directory to find a clinic.
Frequently asked questions
When do kittens open their eyes?
Around seven to ten days, though some take up to two weeks.
When do they start eating solid food?
From about four weeks.
When do kittens become adults?
Around one year, with some breeds maturing later.
When is the best time for socialization?
Between two and seven weeks, with continued exposure up to about twelve weeks.
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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