Both male and female hedgehogs make equally good pets so this decision is entirely your own. You can readily tell a boy from a girl. If the hedgehog is tame and friendly, gently roll it over and look at the area closest to the tail. A female's genitals are immediately next to the anus, while the male's penis sheath, or "belly button" is farther up the tummy. The distance between the anus and belly button will be approximately 1/2 inch on a six week old male hedgehog. However, this distance can increase to as much as an inch or more once it fully matures.
For more information about breeding hedgehogs click here.