After a power outage, Lauren suddenly becomes paranoid about every little thing and worries that she isn't ready to take care of a baby. Andrew, on the other hand, is feeling very confident about his parenting abilities -- until he kills a mock "baby" at their infant CPR class. Meanwhile Andrew's friend, Danny, excels in class by flirting with the 52-year-old-teacher, and Cooper uses Julie's sexy baby blog as a way to bond with the "brown baggers" at her firm.

When Lauren's cool younger sister, Heather, visits for a job interview, Lauren launches a campaign to convince her to move to Los Angeles. She would love to have Heather nearby when the baby's born, but will her aggressive attempts to sell her sister on LA end up pushing her away? Meanwhile, as Lauren's consumed with her sister's visit, Julie convinces Cooper to keep her company while Eric's away on business. But when new mom Julie falls asleep from exhaustion, Cooper is confronted with one of her greatest fears -- a crying baby Perry.

Cooper hopes that making a new friend will help take her mind off of Lauren’s baby issues. Andrew fixes up Julie and Eric’s yard for Perry’s party. This could cause problems for Eric and Julie, because Danny wants a job playing piano at the party. Can Eric and Julie have the party and keep their friendship with Danny?

Lauren and Andrew have to choose a guardian their daughter after a meeting with a lawyer doesn’t go so well, Lauren and Andrew decide to see how their neighbors will do as guardians. Plans to tell the neighbors the good news only get worse when Andrew lets the cat out of the bag too soon.

Julie and Andrew try to get Lauren’s mind off the pregnancy and on to something else. Danny wants to find a girl he hopes baby Perry will help him do that.

Lauren and Andrew's baby arrives well at a concert they soon discover there having a little trouble getting to the hospital.