According to the New York Longitudinal Study, by approximately 3 months of age infants exhibit enough behaviors that they can be classified as one of _____ temperamental categories.

Question

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The New York Longitudinal Study identified four temperamental categories for infants by 3 months of age, including easy, difficult, slow-to-warm-up, and a fourth category that was later added called "intermediate."

According to the New York Longitudinal Study, by Approximately 3