As mentioned in the textbook, infants can imitate facial expressions within the first 36 hours of life. Someone might argue, however, that if that were correct, babies wouldn't cry for unexplained reasons. The skeptic might say that babies would always smile when their adoring parents or care-givers smile at them. Hopefully, you would reply that

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The study was not focused on what babies mostly or always do, as individual differences and unique circumstances can impact their behavior. Rather, the key finding of the study was that newborns have the ability to imitate facial expressions, which suggests an early understanding of social interaction and communication. The fact that babies may cry for unexplained reasons or not always smile in response to a parent's smile does not negate this finding.

As Mentioned in the Textbook, Infants Can Imitate Facial Expressions