Through a misunderstanding, Junie B. thinks that her new baby brother is really a baby monkey, and her report of this news creates excitement and trouble in her kindergarten class.
When Nick learns that a kindergarten classmate and his own father not only look alike but have the same name, he wonders if they could possibly be the same person.
Annalina's diary entries reflect her feelings and experiences as she goes from being afraid to go to kindergarten to loving it during her first month of school.
Louise loves some of her kindergarten activities, such as painting, while from other school experiences she learns to give and take with her classmates.