Pinned Tweet
It is an incredible fact that women in the past had far more children at older ages than women do today, even without the benefit of modern technology.

Assisted reproductive technology is supposed to extend the fertility window, and yet childbearing ends sooner now than it did idge Population Group)
53
165
1,331
57,393
Replying to @MoreBirths
Here is data for Iceland. Once again fertility for women in their 40s was once much, much higher than it is now. What is going on? (3/4)
5
8
151
14,767
Replying to @MoreBirths
Did something change that women are hitting a limit to their fertility sooner than before?

Or is there a taboo against having children past 40?

Fertility extension seems like a failure so far, given that fertility in the 40s is actually *much lower* than it was in the past! 4/4
15
2
156
4,402
More Births retweeted
A picture that speaks a thousand words:

This is the Leastadian Luthern Church growth model.

Photo of a Laestadian Lutheran Church gathering in Wasilla, Alaska. In recent years many Leastadians have moved to this congregation.
2
8
190
6,988
More Births retweeted
the fertility collapse is increasingly looking like a marriage collapse

fertility within marriage has held up far better than overall fertility

the problem is that far fewer people are married when they're young, and those who do marry are doing it much later

you cannot have a e forming families
it's just wild to me that age-controlled fertility within marital durations is actually rising in the U.S, and by a lot!

fertility at 15-19 years marital duration for women aged 30-39 has risen ***50%*** since 2008-10!

but marriage rates have cratered
69
125
1,065
61,479
Why vote Republican this election season? Conservative policies have proven far better for families.

Over the time, the birth rate has been holding steady in red states while crashing in blue states because of better housing, lower taxes, a stronger job market and more. 🧵!
12
70
650
21,986
Replying to @MoreBirths
School choice, favored by 80% of parents, is another area where conservative leadership favors families.

Only Republican-led states have embraced school choice. Not a single Democrat-led state has gotten it. (Heritage, 2025-2026 school year). 7/8
3
0
16
885
Replying to @MoreBirths
Family friendless matters more than almost anything else for America's long-term success.

Republican leadership has brought lower taxes, more and better-paying jobs for young people, and bigger, more affordable houses.

And ultimately, more thriving families. 8/8
1
1
24
862
More Births retweeted
Are you working on a paper about how some policy influenced fertility?

Submit it here for a chance to present AT THE UNITED NATIONS in spring, 2027!
ngofamilyny.org/call-for-prese…
2
3
14
2,435
A new UN report published this month found a fertility rate of 3.3(!) for Mongolia, more than triple that of neighboring China.

Mongolia does what most Western governments are too squeamish to do. It directly asks women to have more children and celebrates those who do.
10
45
329
6,593
We know that culture drives fertility more than money these days, but what specifically is it about culture?

In wonderful report published today, @FamStudies surveyed 10,000 people around the world to learn what it is about culture that leads people to have kids or not. 🧵.
In this new report, @lymanstoneky @PeterRFB and @DrJasonCarroll begin the work of opening the black box of fertility culture. We explore the specific factors across and within societies that lead some people to have many more children than others.

We used a survey of nearly over a dozen countries.
Most of our survey covered questions that have rarely, if ever, been
surveyed cross-nationally, or have not been surveyed in a research program that also. As a result, we can present first-of-a-kind evidence on what specific. cultural norms typify successful pronatal cultures.

Here are our main findings:

1. Friends and family matter to fertility intentions.

2. The family lives of celebrities (and the visibility of celebrity family lives)
influence the family lives of fans.

3. Effective pronatal beliefs entail positive attitudes towards family life, but not necessarily any particular sense of obligation.

4. Division of household labor does not have a big impact on fertility.

5. Active faith matters to fertility desire and outcomes.

6. A willingness to take risks and an optimism about the future both predict intentions to have children and the number of children a respondent already has.
8
26
127
8,245
Replying to @MoreBirths
Here is a link to the new report, the first to really explore, through global surveys, what it is within culture that drives fertility preferences and outcomes. 9/10
ifstudies.org/report-brief/b…
1
2
17
1,458
Replying to @MoreBirths
And here is the accompanying data browser, where you can explore how 10,000 people responded to about 100 different cultural questions and how different parts of culture map to different fertility outcomes. 10/10
ifstudies.org/resources-and-…
0
3
23
1,405