Lily's comfort object is a soft, stuffed object called "elephant" that she takes to bed with her. In the book, a comfort object is a soft "imaginary creature" (as animals are referred to in the book) that each child receives as a baby to hold on to. Children in the book are given a comfort object as a baby and are able to have them until they are seven years old. Once a child reaches age eight, they can no longer have their comfort object. Once a child is too old for a comfort object, the comfort object is used again for a new baby that is born. Lily's brother used to have a comfort object called "bear" before he turned eight years old.