Designed to explore factors that cause negative pregnancy outcomes. Questions were asked of pregnant women concerning prenatal care, weight gain or loss during pregnancy, alcohol, cigarette, or drug use during pregnancy, and whether vitamin or mineral supplements were taken before or during pregnancy. In addition, questions were asked about the use of home pregnancy tests, exercise before and during pregnancy, medical care before, during, and after delivery, previous pregnancies and their outcomes, birth control use, and how the mother felt and behaved. Demographic information about the mother such as marital status, marital history, date of birth, state of birth, mother's weight at birth, weight changes before, during, and after pregnancy, height, race, education, work history, and place of residence was obtained. Information about the father includes items such as age, height, weight, education, and job status. In addition, family income questions were asked, as were questions about the health, care, and feeding of the baby. Information was also taken from birth certificates and fetal and infant death certificates. Also see the Longitudinal Follow-up, 1991. This follow-up consists of 3 components that provide information on early childhood morbidity and health. The Live Birth Survey (Part 1) obtained data on national health issues affecting children, such as child development, effects of low birth weight, childhood injury, child care, pediatric care, health insurance coverage, child safety, and acute and chronic childhood illnesses. For the Medical Provider Survey (Part 12), respondents to the Live Birth Survey were asked to provide the names of all medical providers and hospitals where their children were diagnosed, treated, and/or admitted. Each health care provider was asked to supply information on its organization, the child's health status and history, and each visit or hospitalization. The Fetal and Infant Death Survey (Part 21) interviewed women who were identified through the 1988 NMIHS as having lost a fetus or an infant during the study period. These respondents were reinterviewed to gather information about their health and about any pregnancies since their loss in 1988.