What to tell a 6 year old about periods?

[Rags]

I'm so pleased I started explaining things to my Ds so early (when he asked the questions). There's no big deal in our house if I find myself in to toilet needing a tampon, I can give him a shout and he'll bring me one, no questions, no embarrassment, no big deal. I do know he find's it difficult at school within his class when anything comes up about babies etc because he is aware that most of the other 7 and 8 year olds believe lots of stories about where babies come from and he knows it's not his job to correct them, I've made a point of explaining that this is up to their parents/guardians/teachers.