We're waiting till we have our first scan around 12weeks to tell our 5 and 6 1/2 year old about the surprise new baby. When we do, there will be a lot of questions. And I mean a lot! They are going to want a completely honest, practical explanation and we are happy to give it but we need some help! Lots of the books out there seem aimed at younger children. Mine will want to know about sperm, ovum, fetal development. So does anyone know of an encyclopedic type book on pregnancy aimed at kids?