Mindy is so excited to be a big sister--but also nervous, because she's never been one before! When her baby brother, Charlie, arrives, Mindy wants to be as helpful as she can. But as cute as he is, Charlie is a lot louder--and more stinky--than she could have imagined! Mindy tries her best but feels like she isn't going anything right. Still, if she can find her own special way to pitch in, she can still prove Charlie is lucky to have a big sister just like her!