The answer to this question is that the author believes that one's soul can incarnate more than once. He believes that consciousness exists even before conception. According to the author, sometimes such transitions are resisted by the spiritual entities. Others await in special holding places until they incarnate into humans. Some clients speak of other previous lives they lived.
Some clients describe their experiences from conception and how they bonded with the fertilized egg.
And yet sometimes the ensoulment is not permanent. If the ensoulment does not continue on a permanent basis, then a miscarriage or stillbirth will result. The author believes that the experiences of his clients tells us that there is a continuity of consciousness both before and after life. During these times we exist in other modes of consciousness. This theory implies that we are all part of the larger process of evolution of the universe.