In 2012, researchers at the Census Bureau changed the focus of the Current Population Survey’s (CPS) June Fertility Supplement, as follows:

• Expanded age range (age 15-50, instead of 15-44);

• Questions about timing of first birth (instead of most recent birth);

• New questions about women’s relationship circumstances at the time of their first birth.

These new, nationally-representative data allow for a more extensive retrospective examination of the relationship status of women at the time that they entered motherhood.