"Kid" is how Rick Blaine ( Humphrey Bogart ) refers to Ilsa Lund Laszlo ( Ingrid Bergman ) in the 1942 Academy Award Winning Best Picture '' Casablanca ''. It is considered a term of enderment when used by romantics of the time period; however, it was almost exclusively used by the male half of a relationship when talking to his wife, girlfriend, romatic attaction etc.
"kid gloves" approach or treatment is a reference to tactful or Diplomatic treatment, deriving from the delicate qualities of Gloves made from the hide of a young Goat .