Bringing home a kitten is exciting—but those first 12 weeks set the blueprint for a healthy, well-adjusted adult cat. Miss the socialization window or skip a vaccine, and you're cleaning up behavioral and medical messes for years. This guide walks you through everything, week by week.
Kittens double their birth weight in the first week and need 3–4 times more calories per pound than adult cats. Here's what that looks like:
| Age | Food Type | Frequency | Daily Amount (approx.) |
|---|---|---|---|
| 0–4 weeks | Kitten milk replacer (KMR) | Every 2–3 hrs (including night) | 8–10 ml per feeding |
| 4–6 weeks | KMR + wet kitten food gruel | 4–5 times/day | Gradually increase solids |
| 6–8 weeks | Wet + dry kitten food (fully weaned) | 3–4 times/day | 1/4–1/3 cup dry equivalent |
| 8–12 weeks | High-quality kitten kibble + wet | 3 times/day | Follow bag instructions by weight |
We recommend Shop Kitten Milk Replacer for orphaned or rejected kittens. Once weaned, a high-protein kitten formula is essential—kittens need ~30% protein and the right calcium-to-phosphorus ratio for bone development.
The maternal antibodies kittens get from nursing fade somewhere around 6–8 weeks—and that's when the vaccine series starts. Missing the window leaves a gap where the kitten is vulnerable.
| Age | Vaccine | Why It Matters |
|---|---|---|
| 6–8 weeks | FVRCP #1 (core) | Panleukopenia kills 90%+ of unvaccinated kittens under 6 months |
| 10–12 weeks | FVRCP #2 | Booster needed; maternal antibodies may still interfere |
| 12 weeks | Rabies (core, required by law) | Single dose; good for 1 year initially |
| 14–16 weeks | FVRCP #3 (final booster) | Ensures lasting immunity beyond maternal antibody window |
| 8–12 weeks | FeLV (non-core, outdoor cats) | Two-dose series, fatal to ~85% within 3 years if infected |
Check our full pet vaccination schedule guide for adult boosters and titer testing alternatives.
This is the single most important fact in kitten development: between 3 and 7 weeks of age, a kitten's brain is wiring its "normal" template. Kittens handled gently by multiple people during this window grow into confident, friendly adults. Kittens isolated during this period often become fearful, aggressive, or unadoptable.
If you're raising orphaned kittens, expose them (safely) to: different people (men, women, children), gentle handling of paws/ears/mouth, carrier exposure, ambient household sounds (vacuum, TV, doorbell), and other vaccinated, friendly cats if possible.
Good news: cats have a substrate preference wired into their brains. Place the kitten in a low-sided litter box after every meal—they'll figure it out quickly. Key rules:
Kittens are chaos agents with claws. Walk your home at kitten eye level:
Schedule the first vet visit within 48 hours of bringing the kitten home. Bring:
Expect the vet to weigh, check for ear mites, listen to heart/lungs, palpate the abdomen, and discuss the vaccine schedule above. Shop Kitten Starter Kits
The first 12 weeks feel like a blur, but each decision compounds. Get the feeding, vaccines, and socialization right now, and you'll have 15+ years with a confident, healthy cat. Skip them, and you'll be undoing damage that could have been prevented.
Affiliate Disclosure: PetCarePicks is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no additional cost to you. We only recommend products we'd use with our own pets. As an Amazon Associate we earn from qualifying purchases.