little one vs preadolescent

little one

noun
  • A young child. 

  • A term of endearment, especially toward a child. 

preadolescent

noun
  • A child who has not yet reached puberty. 

adj
  • Of or relating to preadolescence. 

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