in utero vs prenatal

in utero

adj
  • Occurring or residing within the uterus or womb. 

adv
  • Occurring or residing within the uterus or womb. 

prenatal

adj
  • Being or happening before birth. 

noun
  • A dietary supplement to be taken by somebody expecting to give birth. 

  • A person who is expecting to give birth. 

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