What is the best age? My KiKi gave birth to 4 kittens on June 6. They are 13 weeks old now but still nursing on and off. I wanted to wait till they were fully naturally weaned by KiKi and keep them together as long as possible for good social behaviors (plus I love them all!). The SO says it should be soon as people are going to want cute little kittens.. not cute awkward staged ones.