Kittens should ideally stay with their mother until they are at least 8 weeks old, with many experts recommending 10 to 12 weeks or even up to 13-14 weeks for optimal development. This period allows kittens to be fully weaned, socialized, and emotionally resilient before separation. Early separation, before 8 weeks, can lead to health problems and behavioral issues.

• Kittens begin weaning around 4 weeks and are usually fully weaned by 8 weeks

• Shelters often approve adoption at 8 to 9 weeks, but longer stays (up to 12-14 weeks) are better for learning social skills and independence

• Staying with their mother and littermates helps kittens learn important behaviors like using the litter box, grooming, hunting, and social interaction

• In the wild, kittens stay with their mother for up to six months to learn survival skills, but domestic kittens benefit from at least 8 to 12 weeks of maternal care

In summary, kittens should not leave their mother before 8 weeks, and ideally remain until 10-12 weeks or more for healthy physical and behavioral development.