baby of the family vs juvenile

baby of the family

noun
  • The youngest member of an immediate family. 

  • A member of an immediate family who behaves as, or is treated as though they were the youngest member of a family. 

  • An adult member of an immediate family who is treated by others in the family, especially the parents, as though they were a child. 

juvenile

noun
  • A person younger than the age of majority; a minor. 

  • A person younger than the age of full criminal responsibility, such that the person either cannot be held criminally liable or is subject to less severe forms of punishment. 

  • A sexually immature animal. 

  • A prepubescent child. 

  • A publication for young adult readers. 

  • A two-year-old racehorse. 

  • An actor playing a child's role. 

adj
  • Characteristic of youth or immaturity; childish. 

  • Young; not fully developed. 

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