"What is Literature?
Defining literature is very subjective but can be well defined as a piece of written art that possesses some sort of educational, moral, or personal value when read.
Value being the key point from a piece of work which would classify it as being a piece of literature or simply just a romance novel. But can we say then that a romance novel is a non-literary work? If after reading a random romance novel, you feel you have gained some educational value or you have put another piece of the puzzle into your life, then one can define such text as "literature . Until then, romance novels are non-literary.
Children's books, however, do add value to a child's life by means of imagination and education. To a child, a simple piece of text or a short story is defined as "literature because that child will grow from reading or having read to him or her text.