How do they get babies to cry in films or on TV shows?

https://www.theguardian.com/lifeandstyle/2017/sep/13/how-get-babies-cr
Wednesday 13 September 2017 06.30 EDT

When a film or TV programme calls for a crying baby or child, how do they ensure that the child complies? Do they wait for the child to cry for a random reason or is there someone on set whose job it is to make babies cry?

George Connelly, Melton Mowbray, Leicestershire

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