According to the work done by Dr. Michael Newton (fascinating book The Journey of the Soul) with clients in very deep hypnosis, the oversoul sends out only a portion of its energy to incarnate. It is possible to have several people in many places coming from the same source. A child would be free of the mental structures we acquire as we grow and there are many examples of people with partial or total recall. This has nothing to do with religion but the wonderful world of spirit.
Reincarnation is a basic tenet in many religions..especially Asian religions
I recall the book about Bridey Murphy from over 50 years ago. It was an interesting read.
Young girl under hypnosis told of her previous life in Ireland several generations before she was born.