Mackenzie is a 10-month-old baby. Her new babysitter tries to hold her, but Mackenzie sobs and tries to wriggle away. This is an example of what?

Mackenzie is upset when an unfamiliar person tries to hold her, which is stranger anxiety. This commonly appears during the first year of life, as babies become more wary of people they do not know. Emotional contagion is catching another person’s emotions, and rooting is a reflex that helps babies find food.

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