By 2 to 3 months of age,most infants expect people to react positively when the infants initiate a behavior,such as a smile or a vocalization.This finding has been discovered using a method called the:

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The still-face paradigm is a research method that involves having a caregiver engage in a face-to-face interaction with an infant, followed by a period of the caregiver maintaining a still face without offering any social cues or responses to the infant's behavior. This paradigm allows researchers to observe how an infant responds to a situation in which their social cues are not met, and it has been used to support the idea that infants expect positive reactions when they initiate a behavior.

By 2 to 3 Months of Age,most Infants Expect People