How to tell the sex of your kitten
Telling the difference between male and female kittens is fairly easy if you know know what to look for, but it is not something that should be attempted before the kitten is 3-4 weeks old.
Not only can excessive handling by humans be very unsettling for a young kitten, but it can also lead to the kitten being rejected by her mother. Furthermore, the older the kitten is, the more developed their genitals become and this naturally makes the process much easier.
Taking all of the above into consideration, and also first ensuring the mother cat is accepting of you temporarily taking her kitten from her, you will need to gently hold the kitten in a position where you are able to lift the tail and take a good look at the genitals. Standing him or her on a table is a good idea as it provides added stability. Be careful not to allow the kitten to twist around whilst you are lifting their tail as this can cause injury.