As you know, Carl Sagan is a noted scientist, teacher and skeptic.
Sagan was a founding member of a group that set out to debunk unscientific claims, and wrote the book The Demon-Haunted World. Yet he has said that there were several areas in parapsychology which deserved serious study, and one of these was "that young children sometimes report details of a previous life, which upon checking turn out to be accurate and which they could not have known about in any other way than reincarnation."
Washington Post article
Sagan was a founding member of a group that set out to debunk unscientific claims, and wrote the book The Demon-Haunted World. Yet he has said that there were several areas in parapsychology which deserved serious study, and one of these was "that young children sometimes report details of a previous life, which upon checking turn out to be accurate and which they could not have known about in any other way than reincarnation."
Washington Post article