At six weeks of age, baby Jessica's newest emotional reaction is MOST likely to be:

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At six weeks of age, a baby's newest emotional reaction is a social smile, which occurs in response to human faces and voices. This is a significant milestone in social development and an indication of the baby's ability to form attachments with caregivers. Fear of strangers typically develops around six to eight months, while surprise and delight reactions may occur earlier.

At Six Weeks of Age, Baby Jessica's Newest Emotional Reaction