Kittens are weaned when they are 40 days old. They can leave the mother cat about a week after weaning, which is about two months. If the kitten is weak, it may take about three months to leave the mother cat. cat. After weaning, kittens can be fed goat milk powder and wet food instead of breast milk. After three months, they can eat kitten food directly. At the same time, kittens should be vaccinated to avoid contracting diseases.