Why do they stop their disruptive behavior towards me?

Update: There are times when a group of people nearby had a baby or small child with them; sometimes the baby/child acted normal, and sometimes they were carrying on. Whenever they did the latter, others have held the youngster to get him/her to stop but he/she kept it up. Similar with animals such as guinea pigs or... show more There are times when a group of people nearby had a baby or small child with them; sometimes the baby/child acted normal, and sometimes they were carrying on. Whenever they did the latter, others have held the youngster to get him/her to stop but he/she kept it up. Similar with animals such as guinea pigs or hamsters: they often squirmed whenever others held them.
Whenever they're handed to me, the child or animal often behaves themselves. In fact, there were times when the baby or animal is
Update 2: handed to another person after me, they resume acting crazy again.
I'm just wondering why babies, small children, and small animals usually calm down whenever I hold them?
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