"Baby Not on Board" is the fourth episode in the seventh season of the American animated television series Family Guy. It originally aired on the Fox network in the United States on November 2, 2008. The episode features Stewie after he is accidentally left at home when the Griffins head for the Grand Canyon. The family soon notice his absence and rush home; however, Peter makes it more difficult for his family because of his immature behavior. Meanwhile, Stewie realizes how much he depends on his family while he is alone.

The seventh season of Family Guy first aired on the Fox network from September 28, 2008, to May 17, 2009, before being released as two DVD box sets and syndicated. The animated television series follows the dysfunctional Griffin family, who reside in the fictional town of Quahog, in the U.S. state of Rhode Island. The show features the voices of series creator Seth MacFarlane, Alex Borstein, Seth Green, and Mila Kunis in the roles of the Griffin family.