From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation!

WAAA!Karen's friend, Nancy, is going to be a big sister. Her mommy is having a baby. At first, Karen is so jealous. Then Nancy promises to share the baby with her. Now Karen is super excited. Nancy might even bring the baby to school for Show and Share! Karen and Nancy can't wait for the baby to be born. But how much longer will it be?