Preventive medical care, morbidity, and mortality among children of migrant agricultural workers were examined using a 1978 representative sample of 145 migrant married women under the age of 50 in Wisconsin. Findings showed fewer than 50% of migrant children under age 16 received recommended annual physical examinations. Only 33% received an annual dental checkup as compared to 50% of children in the total United States population. A comparison between levels of chronic health conditions for migrant children and those reported for children in a national survey suggested that incidence of chronic conditions was several times greater among migrant children. Younger children were more likely to receive checkups, while older children were more likely to receive immunizations. After controlling for the child's age, no significant association was found between preventive care and any characteristics of the mother. Mothers who spoke English were more likely to report that a child had a chronic condition. The level of mortality was proportionately lower among women who spoke English and higher among those who gave birth to a low birth weight child. The most important characteristic related to loss of children was whether or not a mother smoked. (NEC)