By Priya Nair RVN · Last updated 19 May 2026
The first year decides what your cat will be for the next fifteen. Kittens have a short, real socialisation window — only about the first 7-9 weeks — and a long list of medical milestones that prevent expensive disease later. Get this year right and you have a confident, healthy adult cat with the temperament you wanted.
This pillar covers feeding by life stage, the vaccination schedule, desexing timing, kitten-proofing the house, and the developmental windows you can’t redo if you miss them. Pair with our cat diet pillar and cat breeds encyclopedia.
Bringing a kitten home — the right age
Eight weeks is the legal minimum in most of Australia and the absolute floor. We prefer ten to twelve weeks. The 8-12 week window is when kittens learn bite inhibition, litter manners, and basic confidence from mum and siblings — separating them too early is the single biggest cause of adult cats that bite during play and never settle in a multi-cat household.
- From a breeder: insist on a written health record, first vaccinations done, microchipped, parents’ health-test results, and a contract that lets you return the kitten if there’s a major problem.
- From a shelter / RSPCA / cat rescue: usually desexed before adoption (Australian standard), vaccinated, microchipped, and the staff have seen the kitten’s behaviour for weeks.
- “Free to good home” via Facebook / Gumtree: we don’t recommend it. Backyard breeders, unvaccinated stock, and the surrender rate is brutal. If you do go this route, get a vet check inside 48 hours.
Feeding by age — what kittens eat
| Age | What to feed | How often |
|---|---|---|
| 0-4 weeks | Mum’s milk or kitten milk replacer (KMR). NEVER cow’s milk. | Every 2-3 hours |
| 4-6 weeks | Weaning. Soft-mashed kitten food + KMR slurry. | 4-5 meals |
| 6-12 weeks | Wet + dry kitten food, fully weaned. High calorie, high protein. | 4 meals |
| 3-6 months | Wet + dry kitten food. Free-feed dry, scheduled wet. | 3-4 meals |
| 6-12 months | Kitten food still — growth isn’t done. | 2-3 meals |
| 12+ months | Transition to adult cat food over 7-10 days. | 2 meals |
Kitten food is genuinely different from adult cat food — higher protein, more fat, more calories per gram, plus extra DHA and arachidonic acid for brain and eye development. Don’t feed adult cat food to a growing kitten and don’t feed kitten food to an adult cat — both cause real, visible problems.
- Brands we recommend: Royal Canin Kitten, Hill’s Science Diet Kitten, Black Hawk Kitten, Advance Kitten. All AAFCO-rated for growth.
- Wet food matters. Cats evolved to get most water from prey. Wet food prevents lifelong urinary tract problems. Aim for at least one wet meal a day from weaning onwards.
- Treats: single-ingredient freeze-dried meat / fish. Skip the dental sticks until adulthood.
Vaccination schedule (Australia)
| Age | Vaccine | What it protects against |
|---|---|---|
| 6-8 weeks | F3 (1st dose) | Feline panleukopenia, calicivirus, herpesvirus |
| 10-12 weeks | F3 (2nd dose) + FIV (1st, if going outdoors) | As above + feline AIDS |
| 14-16 weeks | F3 (3rd dose) + FIV (2nd) + FeLV if at risk | Full protection achieved |
| ~1 year | Annual booster | Top-up |
| Adult | F3 every 1-3 years, FIV annually if outdoor | Per vet’s risk assessment |
Parvovirus (panleukopenia) outbreaks happen in Australia every couple of years and kill unvaccinated kittens fast — typically within 48 hours. The 3-shot schedule isn’t optional theatre; it’s because maternal antibodies in milk neutralise early doses, so we need to vaccinate again past the point those antibodies wane.
Desexing — when and why
- 4 months is now the recommended age in Australia (RSPCA, AVA, Cat Protection Society). The old advice of “wait until 6 months” came from outdated surgical-risk concerns that modern anaesthesia has largely resolved.
- Why early: females can fall pregnant from 4-5 months. Males start spraying urine to mark territory at 5-6 months and the spraying habit can persist for life if they desex late.
- What it costs (AU): $150-300 for males, $250-450 for females, depending on clinic. RSPCA-subsidised clinics around $90-150.
- Recovery: males back to normal in 24-48 hours. Females need 7-10 days, with confinement to a small room and an Elizabethan collar so they don’t pull stitches.
Microchipping + registration
Microchipping is legally required for all cats in NSW, VIC, WA, ACT, and Tasmania. Done at the same time as desexing usually. The chip number must be registered with your state’s pet registry — many people miss the registration step, which means the chip is in the cat but doesn’t actually point back to you.
The socialisation window
Kittens have a sensitive period from roughly 2 to 9 weeks where new sights, sounds, people, and other animals shape the rest of their life. After about 9 weeks, novelty starts looking scary instead of normal. If you have a kitten in that window, deliberately expose them to:
- Different people — men, women, children, people in hats / glasses / beards. Brief, positive encounters with food.
- Household noises — vacuum, hairdryer, washing machine, doorbell.
- The carrier — leave it out as a permanent piece of furniture, throw treats inside, feed meals inside. The cat that hates the carrier as an adult is the one that only ever saw the carrier on vet day.
- Car rides — short, positive, ending somewhere good (not always the vet).
- Brushing, nail trims, ear cleaning, mouth opening — the more handling now, the easier grooming and vet visits are later.
Kitten-proofing the house
- String, ribbon, hair ties, rubber bands — kittens eat them, they bunch up in the gut, surgery to remove. Put away.
- Cords (blind cords, charger cables) — strangulation and chewing risk. Run cables along the wall or under cord covers.
- Toxic plants — lilies are lethal to cats even from pollen, even from drinking the vase water. Get rid of lilies entirely. Also: dieffenbachia, philodendron, peace lily, sago palm, oleander.
- Open dryer / washing machine — kittens curl up in them for warmth. Check before every cycle.
- Open balconies — high-rise syndrome is real. Cats fall, especially when chasing birds. Mesh enclose or keep windows secured.
- Toilet lids — drowning risk. Keep down.
- Cleaning products, antifreeze, paracetamol, ibuprofen — all toxic.
Litter training
Litter training is usually self-installing. Kittens learn from mum by about 4 weeks. If yours isn’t using the box, the answer is almost always one of: too few boxes (rule is n+1, so 2 boxes for 1 cat), wrong litter (clay vs clumping vs crystals), box in a high-traffic area, or a medical issue (urinary tract infection). Vet-check first if the kitten was using the box and suddenly isn’t.
Parasites — the boring but important list
- Worms: kittens are born with worms via mum’s milk. Treat every 2 weeks from 4 weeks old until 12 weeks, then monthly until 6 months, then every 3 months for life. Drontal kitten / Milbemax kitten / Profender spot-on are the standards.
- Fleas: monthly spot-on (Bravecto Plus, Revolution Plus, Advocate) from 8 weeks. Bravecto Plus also covers intestinal worms and heartworm — most efficient option.
- Ticks: paralysis tick is the killer along the east coast. Bravecto Plus covers ticks. If you’re in the tick zone, this isn’t optional.
- Ear mites: classic kitten parasite, dark “coffee grounds” wax. Vet diagnosis + 2-3 weeks of treatment.
Vet milestones — what to book in the first year
- 8-week check — first vet visit, first vaccine, weight, general health.
- 12-week check — second vaccine, growth check, microchip if not done.
- 16-week check — final kitten vaccine, dental check, behaviour chat.
- 4-month surgery — desexing.
- 12-month annual — first adult booster, weight assessment, transition to adult food discussion.
Warning signs in the first year
- Repeated vomiting (more than once in 24h) — vet call
- Diarrhoea longer than 24-48 hours — vet visit (parvo, giardia, dietary)
- Not eating for 24+ hours — emergency in kittens, hypoglycaemia risk
- Wheezing / coughing / nasal discharge — herpes, calicivirus, cat flu
- Limping — fracture, joint, infection
- Discharge from eye — herpes (very common in kittens), needs treatment
- Crying when toileting — UTI or blockage — urgent
Where to next
Once the kitten is past 4 months and desexed, the diet and behaviour pillars become the next reads. Move to our cat diet pillar, cat behaviour decoded, and our cat health warning signs reference for the vet-flagging cheatsheet.
Sources: RSPCA AU Caring for Kittens, AVA Pediatric Veterinary Guidelines, Cat Protection Society of NSW, ISFM Feline Friendly Standards.
Page last updated 19 May 2026. We re-check our pet-care content regularly and update when something changes.
