Periods - the girls already have an inkling and know a bit about this as I have NO privacy in the toilet whatsoever! They are so observant ie. "what's that string between your legs mummy?" - in the change room at the swimming pool mind you!!! And wearing pads at home they have asked about them and the blood so that conversation has already started. Like the conversation about why I have big boobies and why I have hair on my gina. Nobody worries about nakedness at our place so they know the difference between boys and girls and all of that - no mysteries there.

They know where babies come from - both vaginally and c/s but they haven't asked how they get there yet. I will deal with that when they ask in an age appropriate and factual manner. I don't think kids should be told untruths but they don't need the full detail until they are developmentally ready to understand it so I break it down to an appropriate level for them to understand.