Tilly's Tummy is a children's book that tells the story of a young girl named Tilly who experiences various feelings and emotions through her tummy. The narrative explores how her tummy reacts to different situations, such as excitement, nervousness, and happiness. The book aims to help children understand their emotions and the physical sensations that accompany them. Through colorful illustrations and relatable scenarios, Tilly's Tummy encourages kids to express their feelings and recognize the connection between emotions and their bodies.