Researchers Alexander Thomas and Stella Chess found that about two-thirds of infants can be classified as having eitheran easy, difficult, or slow-to-warm-up temperament.

Name: Researchers Alexander Thomas and Stella Chess found that about two-thirds of infants can be classified as having eitheran easy, difficult, or slow-to-warm-up temperament.
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Alexander Thomas and Stella Chess's research showed that about two-thirds of infants can be categorized into one of three temperament categories.

Researchers Alexander Thomas and Stella Chess Found That About Two-Thirds