1. 0-8 weeks: Kittens are completely dependent on their mother for milk, warmth, and socialization. They should stay with their mother during this time.
2. 8-12 weeks: Kittens are starting to wean off their mother's milk and learn to eat solid food. They're also starting to become more independent and playful. This is the ideal time for kittens to be adopted and begin their new life with a loving family.
3. 12-16 weeks: Kittens continue to develop physically and socially. They're learning how to use a litter box, play appropriately, and interact with humans and other animals.
4. 6 months and beyond: Kittens are considered fully grown and can be spayed/neutered.
Key takeaway: It's not a fixed number of months. The most important thing is to ensure a kitten is old enough to be separated from its mother and ready for a new home. Talk to your veterinarian or a reputable shelter for personalized advice on when a kitten is ready to be adopted.