Why do American infants have a greater amount of vocalization, and particularly of happy vocalization, than do Japanese infants? To answer this question, 30 Japanese and 30 American first-born, 3- to 4-month old infants equally divided by sex, and living in intact middle class urban families were observed in their homes on two consecutive days…

In this study of prominent characteristics of parenting in the United States, France, and Japan, 72 mother-infant dyads were examined. The study focused on three prominent interactive domains of visual and vocal exchange between mother and baby (nurturing, social exchange, and didactic stimulation), examining their frequency of occurrence and…