babe in arms vs lastborn

babe in arms

noun

  • An infant. 

lastborn

noun

  • The youngest child of a family. 

  • The youngest member of any company or organization. 

adj

  • Born last in a family; youngest in a the family. 

  • Younger than anyone else in a group. 

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