I agree very much with Paul’s overall comment. I would just add, if this remains of interest to you to the point it’s distracting, it may help pacify your analytic, questioning mind to look at some reasonable scientific investigations (don’t get pulled off track by looking around the net as you will get caught up in very heated, unpleasant fights between skeptics and others). You could look up Ian Stevenson and Jim Tucker, both of whom have done excellent work, recognized as such by Alan Wallace.
But I probably should repeat, unless this is really an ongoing concern, probably best to leave such things aside until much meditative stabilization has been developed (and then, you may lose interest in it:>))