postpartum vs prepartum

postpartum

adj

  • Of a mother: after giving birth (often defined as within 30 days after childbirth). 

adv

  • After giving birth. 

noun

  • The period immediately following childbirth. 

prepartum

adj

  • Before giving birth; prenatal. 

How often have the words postpartum and prepartum occurred in a corpus of books? (source: Google Ngram Viewer )