Oh, baby!: Katie accidentally switches places with her best friend's baby sister, and must figure out a way to explain how the baby was able to talk without letting anyone know what really happened. Girls don't have cooties: Katie wants to go to Suzanne's sleepover party, but Jeremy wants her to ride the new roller coaster with him. Annoyed, Jeremy and the other boys decide that all girls have cooties. When Katie literally finds herself in Jeremy's shoes, she tries to reunite the boys and girls.