Jimmy Olsen's Greatest Costumes and Disguises #13
"BABY GIRL DISGUISE"
|I love that Superman's first reaction is not to ask about the giant robot, or to ask Jimmy if he's okay, but instead he just wants to know why the hell Jimmy is dressed like that.
Jimmy Olsen becomes "The Baby Who Saved Metropolis" in Superman's Pal Jimmy Olsen #77. In this story, dump trucks and other construction equipment are going crazy and smashing up Metropolis. Jimmy comes up with a plan to save the day that inolves dressing up as a baby girl in order to trick a giant robot from another dimension.
Jimmy's plan works, but then backfires on him when the robot picks Jimmy up and feeds him milk from a bottle. Luckily Superman shows up before the robot tries to change Jimmy's diapers.