postnatal vs prenatal

postnatal

adj
  • after being born, of or pertaining to the period immediately after birth 

  • (of a mother) after giving birth 

prenatal

adj
  • Being or happening before birth. 

noun
  • A dietary supplement to be taken by somebody expecting to give birth. 

  • A person who is expecting to give birth. 

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