2001h-553 aa5758 casereports casestudies child childanalysis childbehavior childbirth childpsychology embryo embryology embryonicdevelopment embryonicstructures fetaldevelopment fetus fiction growth human infant longitudinalstudies mammalian maternal-fetalexchange physiology pregnancy prenatalcare prenatalexposuredelayedeffects prenatalinfluences psychoanalyticinterpretation psychoanalytictherapy psychologicalaspects psychology twins ws105p662f1992