User blog comment:A.J. two/An argument to the Conception Theory./@comment-3568630-20110530040636

I don't really see how that figures into it. Whether it was conception or birth, it was still a shared memory between the two subjects. What makes you think that it just automatically went to the earliest memory? In any case, I would imagine that there's some kind of technical difference between memories from inside the womb, and those of life after birth.