Baby is a musical with a book by Sybille Pearson, based on a story developed with Susan Yankowitz, music by David Shire, and lyrics by Richard Maltby Jr. It concerns the reactions of three couples each expecting a child. The musical first ran on Broadway from 1983 to 1984.

David Lee Shire is an American songwriter and composer of stage musicals, film and television scores. Among his best known works are the motion picture soundtracks to The Big Bus, The Taking of Pelham One Two Three, The Conversation, All the President's Men, and parts of the Saturday Night Fever soundtrack such as "Manhattan Skyline". His other work includes the score of the 1985 film Return to Oz, and the stage musical scores of Baby, Big, Closer Than Ever, and Starting Here, Starting Now. Shire is married to actress Didi Conn.