baby doll vs heartmate

baby doll

noun
  • A young attractive woman; sweetheart, darling. 

  • A style of women's nightdress. 

  • A child's doll designed to look like a baby. 

heartmate

noun
  • A sweetheart. 

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