Temperament in Babies as an Evolutionary Adaptation

It might also be difficult to extend the categories of temperament across cultures when the categories mean different things in different environments. For example, "difficult" babies in Western cultures are those who do not sleep for long periods and those who cry. Under a different caretaking package, these reactions would not even show up. More important, there is no reason to assume that what is "bad" in one culture will end up "bad" in another culture. Dutch researcher Marten de Vries fo...