A Baby Sister for Herry is a 1984 Sesame Street storybook that follows Herry Monster as he deals with the arrival of his new baby sister, Flossie. The day after Herry's baby sister is born, he visits his mother in the hospital, and she shows him the baby, Flossie, in the nursery. She arrives home a couple of days later. Herry has a hard time adjusting to his new sister, who cries when Herry makes noise playing with a toy fire truck, and is too young to play with him. The baby interrupts Herry and his father making a puzzle because she is hungry, and uses his old blanket. Every weekend, friends and relatives visit to bring her presents and take pictures of her, and Herry feels left out.