Flipped is a young adult novel

Young adult literature

Young-adult fiction or young adult literature , also juvenile fiction, is fiction written for, published for, or marketed to adolescents and young adults, roughly ages 14 to 21. The Young Adult Library Services of the American Library Association defines a young adult as "someone between the...

 by Wendelin Van Draanen

Wendelin Van Draanen

Wendelin Van Draanen is an American author of children's books.- Biography :Van Draanen lives in California with her husband Mark Parsons and two sons, Colton and Connor. She is the daughter of chemists who emigrated to the U.S. from Holland...

 set from c.1994-2000. It is a stand-alone teen romance

Romance novel

The romance novel is a literary genre developed in Western culture, mainly in English-speaking countries. Novels in this genre place their primary focus on the relationship and romantic love between two people, and must have an "emotionally satisfying and optimistic ending." Through the late...

 in a he-said she-said style with the two protagonists alternately presenting their perspective on a shared set of events.

In the beginning, Julianna falls hard for Bryce. Naturally, being 7, Bryce has no interest. However, as the novel progresses, both children grow up and their emotions change drastically.
Julianna "Juli" Baker meets Bryce Loski two days before the beginning of second grade; it's something about those blue eyes that attract her.