In most settings, an easy temperament is associated with more positive adaptation. however, in times of famine, infants with "difficult" temperaments in the masai tribe have been known to outlive babies with "easy" temperaments. this finding is used to illustrate the important effect that has on developmental outcomes.

This finding is used to illustrate the important effect that goodness of fit has on developmental outcomes. Children's temperament is the biological differences that children present in their process of reactivity and self-regulation during childhood. Many investigations have shown that temperament influences the parent-child relationship in a mutual way, and affects the socio-emotional development of the infant. Generally, a higher survival rate has been associated in infants with easy temperament, however, in the Masai tribe, this is the opposite since infants with difficult temperament demand more food and this guarantee their survival.

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