A crime boss has offered recently paroled 3-foot-tall jewel thief Calvin Sims (Marlon Wayans) and partner Percy (Tracy Morgan) $100,000 to steal a famous diamond. But the heist goes bad, and Calvin drops the jewel into the purse of Vanessa Edwards (Kerry Washington). Following Vanessa and her husband Darryl (Shawn Wayans) to their suburban home, Percy and Calvin overhear them discussing starting a family. So they devise a plan to recover the stolen gem: Calvin will masquerade as a baby, infiltrate their home and sneak away with the diamond. After finding Calvin in a baby basket on his front porch, Darryl leaps at the chance to prove he’s ready for fatherhood by caring for the abandoned baby. But the tough, cynical Calvin finds life as a baby to be a living hell, and retrieving the diamond much harder than he’d imagined.