Junie B is not happy about a new baby in the family ... until her grandma tells her he's the cutest little monkey ever. A monkey brother? Now that's exciting! Junie B. Jones is going to have a new baby at her house. Only that is not a very good surprise. Because babies smell like P.U. (Junie B. smelled one once). But good news! Grandma Miller tells Junie B. the new baby is a little monkey! Now Junie B.'s two bestest friends are giving her everything they own just to see him. And guess what else? Maybe she can bring him to school on Pet Day! ... The world's funniest kindergartner is brought to full-colour life in this new adaptation.