Has completed fertility fallen, or have women just delayed childbearing?
Core argument: The average number of children for a 30-year-old woman fell from 1.34 in 2000 to 0.98 in 2024, while completed fertility ended up at the same level, reflecting a change in the timing of births.
What has changed is the timing of births. Remember this is a cross-section based on the year we are observing. In 2000, a 30-year-old woman had, on average, 1.34 children. In 2024, that number had dropped to 0.98. The two cross-years ended up in the same place, but they follow very different paths to get there. Before you ask, is this all immigration? No. We can track nativity status in this data. For women 41 to 44 who have at least one native-born parent, the weighted average number of children was 1.88 in 2000 and 1.87 in 2024. Now completed fertility used to be higher than it is today. So when did the drop happen? We can look at the average number of births for women ages 41 to 44 in each CPS Fertility Supplement, going back every two years to 1976, as shown in Figure 2. The big drop happened some time ago. But the headline is how stable completed fertility has been for more than two decades.



