How can I create a safe space to talk about periods with young menstruators?

A safe space isn't necessarily a physical place, it's more of a vibe that you create. Before getting into a conversation about periods, everyone involved should be in a comfortable sitting, preferably with a trusted group of peers. There's no correct age to start talking about periods, and it shouldn't just be one conversation. A child's understanding (all genders included) should be built up - this can be done using basic words to explain periods and reproductive processes, but, make sure to be honest and don't use too many euphemisms that might make your child think that periods are something to be secretive about!