Attachment Behavior in Thirteen-Month-Old, Opposite-Sex Twins

BROOKS, JEANNE, and LEwis, MICHAEL. Attachment Behavior in Thirteen-Month-Old, Opposite-Sex Twins. CHILD DEVELOPMENT, 1974, 45, 243-247. 17 sets of opposite-sex twins, 13-14 months old, were observed in a playroom situation with their mothers. Attachment behaviors, toy preference, style of play, and activity level were recorded. Analysis of 4 attachment behaviors indicated that girls looked at and maintained proximity with their mothers significantly more often than did their brothers. Girls also touched and vocalized to their mothers more