From beloved author-illustrator Rosemary Wells comes a brand-new story about the inimitable brother and sister Max and Ruby. Max and Ruby's family is expanding and soon enough nobody will be getting any sleep!

Max and Ruby are in for a big surprise. Mama has a baby in her tummy and soon the family will be bigger and better. Luckily Ruby knows all about babies: what they eat, how to bathe them, and where they come from. Ruby tells Max all about it. Soon no one will be getting any sleep, but Max has an idea on how to help!

Max and Ruby have their own TV show on Nick Jr.!