heritage vs lying-in

heritage

noun
  • A birthright; the status acquired by birth, especially of but not exclusive to the firstborn. 

  • A tradition; a practice or set of values that is passed down from preceding generations through families or through institutional memory. 

  • Having a certain background, such as growing up with a second language. 

  • An inheritance; property that may be inherited. 

lying-in

noun
  • The final stages of pregnancy; accouchement. 

  • A period of postpartum confinement, typically a month or longer, formerly common in Europe and still practiced in some parts of the world. 

adj
  • of, or relating to childbirth or postpartum confinement 

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