How can you determine the gender of a kitten - specifically, how to tell if a kitten is a boy or a girl?

To determine the gender of a kitten, you can look at their genitalia. Male kittens have a small distance between the anus and the genital opening, which is where the penis will be visible. Female kittens have a larger distance between the anus and the genital opening, and the opening is rounder in shape.