According to the New York Longitudinal Study's four-way topology of temperament profiles, most infants showed the following profile:

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The New York Longitudinal Study's four-way topology of temperament profiles found that the majority of infants showed an "easy" temperament profile, characterized by regular biological rhythms, adaptability to change, positive mood, and ease of approach to new situations. Difficult babies were relatively rare, while slow-to-warm-up and happy babies represented the other two temperamental profiles.

According to the New York Longitudinal Study's Four-Way Topology of Temperament