Their First Mistake is a Laurel & Hardy sound short film released 5 November 1932.
Mrs. Hardy is annoyed that her husband Oliver seems to spend more time with his friend Stanley than with her. After a furious argument, Mrs. Hardy says that she will leave him if Ollie goes out with Stan again. Stan suggests that Ollie adopt a baby, which he does. Upon returning, his wife has left their apartment, and a process server delivers a paper informing Ollie that she is suing him for divorce, naming Stan as co-respondent. The boys are left to look after the infant on their own.