Filmmakers have a variety of techniques they use to make baby "actors" cry on cue. These techniques can vary depending on the preferences of the filmmakers and the temperament of the baby in question.
One method that filmmakers may use is to simply wait for the baby to cry naturally. This approach is often used when filming emotional scenes in which the baby is supposed to cry in response to something happening around them. The filmmakers may create a situation that they know will cause the baby to cry, such as separating the baby from its mother or introducing a loud noise.
Another approach that filmmakers may use is to use stimuli to elicit a crying response from the baby. This can include things like blowing air in the baby's face or making a sudden noise. These stimuli can be effective at getting the baby to cry, but filmmakers must be careful not to use anything that could harm the baby or cause them distress.
In some cases, filmmakers may use a mild form of physical stimulation to make a baby cry. This can include things like tickling the baby or lightly pinching them. However, it's important to note that any physical stimulation used must be safe and not cause harm to the baby.
It's worth noting that the use of any of these techniques is closely regulated by child labor laws and regulations. Filmmakers must follow strict guidelines to ensure the safety and well-being of the baby actors on set. This includes limiting the amount of time the baby spends on set and ensuring that they are properly cared for and supervised at all times.
In conclusion, there are several techniques that filmmakers may use to make baby "actors" cry on cue. These techniques can vary depending on the temperament of the baby and the preferences of the filmmakers. However, it's important to note that any techniques used must be safe and in compliance with child labor laws and regulations.