This study investigated the effect of mother's country of origin and baby's birthplace on infant birth-weight. The mean birth-weights of full-term babies born of well immigrant women from 5 countries were compared with those of women of Anglo-Australian origin confined at the same hospital. Data were collected from medical records at Canterbury hospital for 1,274 women confined between 1989 and 1992 and 2,524 of their babies. Multiple regression analysis showed that infants born in Australia to women from Vietnam and Korea were significantly heavier than infants born to these women in their country of origin. Babies born to women from Vietnam were significantly lighter than babies born to Anglo-Australian controls.