Ever since she was a few weeks old, shelly has been an unusually contented baby who sleeps and eats well and adapts easily to new experiences. a developmental psychologist would probably describe shelly's temperament as being:

The correct answer is that Shelly has an "easy temperament".
A temperament is described as a he aspects of personality which might be biologically based, or innate, in preference to found out. It is said that infants are usually referred with the aid of temperament, however longitudinal research inside the 1920's started out to set up temperament as some thing which is stable throughout the lifespan. Temperament is determined via specific behavioral profiles, typically specializing in the ones which are both without problems measurable and testable early in adolescence.