"Celebrate Halloween with the Berenstain Bears! Here are three favorite stories by Stan and Jan Berenstain--about pumpkins, ghosts, and trick-or-treating."--P. [4] of cover.
When Mama announces that she is going to have a baby, Sister Bear is curious about where the baby came from and how it is going to get out of Mama's body.
The bears in Bear Country grow concerned about how pollution and waste of natural resources are damaging the world around them, so they form The Earthsavers Club.
Annoyed that Sister Bear always beats them at baseball and other "boy" type activities, her brother and other male cubs try to exclude her from their new club.