Stability of ratings vs. perceptions of temperament from early infancy to 1-3 years.

A new caretaker questionnaire for assessment of NYLS temperament characteristics in one-to-three-year-olds, part of a series of such instruments, is described. A study of stability of individual differences from early infancy to one-to-three years found significant correlations on all dimensions. Maternal general impressions, however, changed in several ways in the intervening time.