Abstract
As part of a methodological study on attachment at one year, the social behavior of 40 infants was assessed in several situations by means of time-sampled observations, ratings, and interviews. The sample was evenly divided between males and females and, within each sex, between first- and later-borns. Girls were found to be more sociable than boys both in the home and in a controlled laboratory setting. Firstborns were more involved with their mothers than later-borns. This involvement seemed to have a negative quality, as evidenced by the greater distress manifested by firstborns and the fact that the interaction between mothers and firstborns was marked by more conflict. These results are discussed in relation to the literature on sex differences in sociability and findings that firstborn children are more likely to have difficulty in social adjustment.
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