Abstract
This study examines 20 pairs of twins with a birthweight of less than 1500 g and their parents during weekly parental nursery visits and during home feedings at 6 weeks, 3 months, and 6 months after the twins' expected date of birth. All infants were rated daily on 19 operationally defined medical complications. During each of these visits various maternal and infant behaviors were recorded and the preference of the mother toward either twin assessed. Results indicate that mothers generally develop a clear preference for one twin within 3 weeks after birth, and that the preferred twin almost invariably is the healthier one. In addition, the preferred twin at 3 and 6 months shows significantly more social behaviors than the nonpreferred twin.
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