The pre-born is a phenomenon known to the Bene Gesserit, but deeply feared. When a pregnant woman consumes the concentrated spice known as the Water of Life, the child gestating in her womb gains the gift of not only cognition, but an awareness of all memories of all ancestors passed down through the genetic heritage of the child. This child is known as pre-born due to the fact that they have begun to live a life—indeed many lives—before birth.

I’m assuming that this flier is from a group of serious Dune fans. It’s the only logical conclusion.