The real Martha from "Baby Reindeer" is a fictional character from the story of "The Night Before Christmas" by Clement C. Moore. In the story, Martha is a small reindeer who is born on Christmas Eve. She is the last of the reindeer to be born, and she has a shiny, new harness and jingling bells that Santa puts on her. She is also the smallest of the reindeer, and she has a special talent for dancing. The story of "Baby Reindeer" has become a classic Christmas tale, and Martha has become a beloved character in the Christmas story.