Her neighbor, Harley Rummel, a bohemian who earns a living by making nudie films in his apartment, becomes interested in her, but Michele believes her boss, wealthy psychologist Philip Brock, is a better prospect as a new mate.

When John Thomas is admitted to Philip's clinic for observation, Harley sneaks into his room to complete a film, but his surreptitious activities are captured by a hidden camera recording the baby's behavior.

The original Baby John Thomas was supposed to be played by 2-year-old Philip Barron, but he didn't get on with Warren Beatty and cried almost every time he went near him, so there was a last-minute change and a Michael Bradley was found so production could start, and both children were used during filming.

Variety called the film "light" and "refreshing" and added, "Well-paced direction of many fine performances, generally sharp scripting and other good production elements add up to a satisfying comedy.

"[3] Time Out New York said, "This dull attempt at an offbeat and sophisticated romantic comedy falls flat on its face, thanks largely to the usual sluggish direction from Arthur Hiller [and] ... a dismal script by William Peter Blatty.