Archie Lee Meighan is a failing cotton gin owner who is married to Baby Doll, a 19-year old childlike beauty whose father arranged the marriage for financial reasons. As Archie awaits the arrival of Baby Doll's 20th birthday, the day that they are supposed to consummate their marriage, he faces interference from business rival Silva Vacarro, who plots to seduce Baby Doll away from Meighan.