christening vs paedobaptism

christening

noun
  • The Christian sacrament at which someone, usually a child, is baptized and given a Christian name. 

  • Any instance of someone's or something's being christened. 

paedobaptism

noun
  • The baptism of infants or young children. 

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