Betty MacDonald was the author of the several children's stories: Mrs. Piggle-Wiggle (1947), Mrs. Piggle-Wiggle's Magic (1949), Nancy and Plum (1952), Mrs. Piggle-Wiggle's Farm (1954), Hello, Mrs. Piggle-Wiggle (1957), and the posthumous collection Happy Birthday, Mrs. Piggle-Wiggle (2007).