Book excerpt: Caillou teases his little sister Rosie about her pacifier, not understanding why she can't be without it. After she gets upset, Mommy takes Rosie in her arms and explains that the pacifier is a way for Rosie to feel reassured and comforted, just like her blankie. Rosie wants to speak, though, and as she starts communicating and becoming more independent, the pacifier becomes less important.