When children's writers literary agents say that they represent juvenile books, it usually means they're interested in both of the categories below. (literary-agents.com)
However, the value of Juvenile books sold (including Young Adult categories) was up in 2016 compared with 2015 numbers. (booknetcanada.ca)
Writers House represents writers of fiction and non-fiction, for both adult and juvenile books as well as illustrators. (writershouse.com)