Two studies were conducted involving a total of 120 children (aged 4-5 yrs) examined (a) children’s ability to produce cross-culturally universal facial expressions of emotion, and (b) the degree of physiological patterning in distinguishing among emotions. Subjects were divided into those with and those without happily-married parents, and participated in a game that directed them to make facial expressions of happiness, anger, disgust, fear, and sadness. Expressions of fear and sadness were more difficult for Subjects to produce than happiness, anger, and disgust. Girls showed more production ability than boys, and boys with unhappily-married parents produced the least amount of faces. Interestingly, subjects with unhappily-married parents showed greater heart rate reactivity while producing facial expressions of emotions than did Subjects with happily married parents.