Developmental Study of Social Behavior in Twin Infants

Abstract

This paper reports our findings concerning the social behavior of twin infants. Twenty pairs of twin infants were observed at 2, 4, 6, 8, 10 and 12 months of age in a home setting. Data regarding frequency were analyzed to determine to what extent genetic and perinatal influences were associated with the development of social behavior. In our results, innate programming was not found to influence infant social behavior during the first year of life. On the other hand, perinatal factors were found to influence infant social behavior before 4 or 6 months of age.