boy vs little girl

boy

noun
  • A male child or adolescent, as distinguished from infants or adults. 

  • A son of any age. 

  • A male of any age, particularly one rather younger than the speaker. 

  • A male servant, slave, assistant, or employee 

  • A younger such worker. 

  • A non-white male servant regardless of age, particularly as a form of address. 

  • Any non-white male, regardless of age. 

  • A male (tree, gene, etc). 

  • A young male. 

  • A former low rank of various armed services; a holder of this rank. 

  • Heroin. 

  • A male animal, especially, in affectionate address, a male dog. 

verb
  • To act as a boy (in allusion to the former practice of boys acting women's parts on the stage). 

intj
  • Exclamation of surprise, pleasure or longing. 

little girl

noun
  • A female child, especially one younger than ten years of age. 

  • A weak-willed person. 

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