How do I socialize a kitten so it becomes friendly?
Quick answer
Socialize a kitten during its sensitive period, which runs from about 2 to 9 weeks of age and largely closes by 12 to 14 weeks.
The full answer
Positive, gentle experiences during this window are what turn a shy kitten into a confident, people-friendly adult cat.
Start with handling. Pick the kitten up for 10 to 15 minutes several times a day, supporting its chest and hindquarters. Touch its paws, ears, mouth, belly, and tail so it learns that being touched is normal, which makes vet visits and nail trims far easier later. Keep sessions short and calm, and let the kitten walk away when it has had enough. Never force interaction or punish a hiss or swat; that teaches fear, not trust.
Next, widen the world in small doses. Invite different people to visit, including men, women, and calm children, and have them offer treats. Play recordings or real household sounds at low volume: vacuum cleaner, doorbell, blender, television. Let the kitten explore a carrier and take short car rides that end somewhere pleasant, not only at the vet. Introduce new objects like boxes, paper bags, and cat tunnels one at a time.
Pair every new experience with food or play so the kitten forms a positive association, and stop if it hides or flattens its ears. If you already have a friendly, fully vaccinated adult cat or a cat-savvy dog, supervised introductions help a lot. Kittens who miss the window are not hopeless, but they need far more patience and a slow, treat-based approach. Because kittens learn social skills from each other, adopting two littermates is often easier than raising one alone.