How to determine the sex of your kitten
Determining a kitten’s sex can be difficult. A female kitten’s genitals are closer to the anus and look like a 'teardrop' or 'slit'. A male kitten’s genitals look more circular and there is more space between the genitals and anus where the testicles will eventually form. Often there are common genders for certain breeds/colouring of kittens. For example, most tortoiseshell kittens are female (but very rarely there is a male).
Image: left is a female kitten and right is a male kitten.