According to Stanislav Grof (1976), perinatal experiences refer to the fetus’ experiences while in its mother’s womb and during the clinical stages of labor and delivery. Clinical observations that Grof made during his extensive LSD sessions provide insight into the structure and experience of the perinatal experiences. In particular, Grof had a lot to say about the traumas that often occur as a result of physical, chemical, or emotional assaults on the fetus during its time in womb or it's passage and emergence (i.e., birth) through the mother's birth canal.