Matched Multiple Birth File

The data allowed researchers to investigate a variety of topics such as the viability of multiples by gender and birthweight discordancy. This series contains microdata on live multiple births occurring within the United States.

The information is collected from the 50 states and the District of Columbia from birth certificates filed at local and state levels . The records include data on prenatal care; the mothers' age, race, marital status, education, place of birth, and Hispanic origin; pregnancy history data on birth order; the fathers' race and age; and medical and health data such as method of delivery, risk factors including tobacco and alcohol use, obstetric procedures, and congenital abnormalities.