If you're reading this site at work, maybe you should save this link until you get home. Unless you work in a German pre-school, where this book seems to have originated.
Where babies come from? In German. [planetdan via tmn]
update: thanks to K, we now know that this is a German edition of Per Holm Knudsen's 1971 Danish sex-ed-for-toddlers classic, The true story of how babies are made. It was reissued in the UK in the 90's, but I'm not finding it.