Thomas and Chess (1977) identified three baby temperaments: easy, difficult, and slow-to-warm-up.
Thomas and Chess (1977) proposed three temperaments for babies: easy, difficult, and slow-to-warm-up. The secure baby is not one of these temperaments. An easy baby quickly adapts to routine, a difficult baby reacts negatively to new situations, and a slow-to-warm-up baby is slow to adjust.
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