After Rebecca meets a new family in her New York City apartment building and helps watch their fussy baby while they are moving in, she becomes convinced that they have been victimized by the kidnappers that have been operating in their neighborhood.
When young monster Harvey hears his parents refer to the new baby they are expecting as "another mouth to feed," he imagines his new sibling as an enormous mouth--and nothing else.
A baby encounters a variety of young animals, including a clever monkey, a hairy warthog, and a dusty lion cub, before discovering the most precious creature of all.
Rosa is excited when her new cousin, Benji, is born, but when Grandma wants to remove a beloved armchair, Rosa puts her foot down and insists that the chair, just like Benji, is a member of the family.