Featuring a beach full of bare-bellied hippos—including one tiny baby who can only say “Bee Bo”—the Belly Button Book! is a quirky addition to the phenomenally successful Boynton on Board series. Every page captivates with Sandra Boynton’s unique illustrations and joyful rhyming text: Soon after dark, upon the beach, we sing a hippo song, and if you’re feeling in the mood, we hope you’ll sing along: “Belly Belly Button, you’re oh so fine. Ooo, Belly Button, I’m so happy you’re mine.”