birth sex vs diathesis

birth sex

noun
  • The sex that someone was assigned at birth (or before via prenatal sex discernment), which may differ, as in cases of intersexuality, from their current sex assignment. 

diathesis

noun
  • A hereditary or constitutional predisposition to a disease or other disorder. 

  • Voice (active or passive). 

How often have the words birth sex and diathesis occurred in a corpus of books? (source: Google Ngram Viewer )