Intersex is when someone's body doesn't fit typical male or female features. This can happen because of different chromosomes (the things that decide if you are a boy or a girl), different hormones, or different body parts. Genetic diagnosis is when doctors look at a person's DNA, which is like a set of instructions for how to build their body, to see if there are any differences or changes that might explain why they are intersex. This can help doctors figure out what kind of medical care and support someone might need to feel healthy and happy.