how old does a kitten have to be to determine sex
DO: Handle your kittens gently. Rest your kittens on a clean towel on their bellies and lift their tails gently to examine their genitals. Where possible, wait to sex kittens until they are over 3-4 weeks of age. Make sure that your cat (the mother cat) is comfortable with you handling her kittens before proceeding to touch them.