Just like that. 🤷 I usually start with something like "boys can have long hair, girls can have short hair, girls can wear pants, boys can wear skirts, boys can wear pink, girls can wear blue,... It doesn't matter. You can be whatever you want to be. And if I want to look like this, it doesn't mean I'm not a girl. It just means I like different things to other girls."
The big difference is that children aren't as "set in their ways" as a lot of adults are and they much more easily embrace new concepts since that's what they do basically all the time. What, you can add numbers together? Ok then. What, a puppy grows up into a dog? Ok then. What, some people who look like boys are actually girls? Ok then. 🤷
i’m not trans but my sister asked about this once, and i just said “well a when she was born, the doctor said she was a boy, so she looks like a boy. But really she is a girl so that’s what we call her”