Infant birthweight (grams)
1 if mother married
1 if mother hispanic
1 if father hispanic
1 if mother born abroad
1 if alcohol consumed during pregnancy
Previous births where newborn died
Mother's age
Mother's education attainment
Father's age
Father's education attainment
Number of prenatal care visits
Months since last birth
Order of birth of the infant
Cigarettes smoked during pregnancy
1 if mother smoked
1 if mother is white
1 if father is white
Trimester of first prenatal care visit
Month of birth
1 if low birthweight baby
1 if first baby
1 if first prenatal visit in 1 trimester