Courses in children's literature can be a valuable part of many different programs of study. Teachers and students of education will learn much about literature that can provide a basis for classroom practices and activites. Students of literature and culture will be interested in learning about the constraints and characteristics of writing designed specifically for an audience of children.
For students of history, studying children's literature offers useful insights into particular ideas about children - and their implications for the present. Considering the ideological content of children's literature provides another perspective for students of developmental psychology and sociology on knowledge about childhood. Students of the visual arts might be specifically interested in courses involving picture books.
And, perhaps, you'd just like to figure out exactly why you read that one book again and again as a child...