filiation vs lying-in

filiation

noun
  • The determination of paternity. 

  • One that is derived from a parent or source; an offshoot. 

  • The condition of being a child of a specified parent. 

  • The ancestry or lineage shared by a group having the same bloodline. 

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 filiation and lying-in occurred in a corpus of books? (source: Google Ngram Viewer )