The labels "easy," "difficult," and "slow-to-warm-up" are used to refer to differences among infants in

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The labels "easy," "difficult," and "slow-to-warm-up" are used to refer to differences among infants in temperament, which refers to individual differences in behavior, emotional reactivity, and self-regulation. This can include differences in how adaptable or easy-going a baby is (easy), how challenging or fussy they are (difficult), or how hesitant or cautious they are in novel situations (slow-to-warm-up). Epigenetic marks are chemical modifications to DNA that can influence gene expression, while stress hormones refer to hormones like cortisol that are released in response to stress. While these factors may interact with temperament, they are not the same as temperament itself.

The Labels "Easy," "Difficult," and "Slow-To-Warm-Up" Are Used to Refer