Babygro vs snapsuit

Babygro

noun
  • An all-in-one suit for a baby made from a stretchy fabric; rompers. 

snapsuit

noun
  • A baby's bodysuit with a snap fastener at the crotch. 

  • An adult garment intended to be worn with a diaper that features a snap fastener at the crotch. 

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