Before revision: "Cry it out" The "Cry It Out" (CIO) approach can be traced back to the book " The Care and Feeding of Children " written by Emmett Holt in 1894.
After revision: Cry it out The "Cry It Out" (CIO) approach can be traced back to the book " The Care and Feeding of Children " written by Emmett Holt in 1894.