according to some psychics, we are all here by voluntary assignment. Like going to college - we take certain courses to learn a lesson, and on completion of all of our college courses get some kind of a degree.
Our spirits enter the body just before, or shortly after, birth. (when children are stillborn simply means there is no available spirits to enter the body at that particular moment) (or that classroom is filled to capacity)
When we have deja vu experiences it is a sign for us to know we are at the right place at the right time in our preplanned curriculum. So it is a good thing.
If we were in a constant state of deja vu we would know the reason for being here and lose the appreciation of the lesson we are here to learn.