This book introduces Stink Moody, the younger brother of the popular Judy Moody, who is convinced he is shrinking! The story follows Stink's comical obsession with his height, as he constantly measures himself and worries that he is getting smaller and smaller. His anxieties are often fueled by fantastical scenarios and scientific (mis)understanding. Megan McDonald crafts a funny, charming, and highly relatable narrative that addresses a common childhood anxiety with humor and warmth. It's an excellent transitional chapter book that celebrates the unique personality and imaginative worries of a middle child.