I glanced at a KS2 workbook in the library the other day and saw that this topic is dealt with during KS2 - but when, exactly?
Ds1 is 7, and knows where babies grow and how they get out, but has never asked me how they get in in the first place! I'd rather I tell him before he learns about this in school, but I'd also rather wait until he asks me. So I need to know how much longer I've got.