Delayed first births and completed fertility across the 1940–1969 birth cohorts

The rise in the age at first birth has been universal in low-fertility countries in the last decades. Mothers who have their first child later tend to have fewer children, and in the absence of fertility catch-up at older ages, delayed fertility contributes to cohort fertility decline. We aim to stu...

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Bibliographic Details
Published in:Demographic research 2023, Vol.48, p.387-420
Main Authors: Beaujouan, Éva, Zeman, Kryštof, Nathan, Mathías
Format: Article
Language:English
Subjects:
1940s (Decade) AD
1950s (Decade) AD
1960s (Decade) AD
Age
age at first birth
Age differences
Birth
Birth intervals
Birth order
Births
Censuses
Changes
Childbearing
Childbirth & labor
Childlessness
Children
completed cohort fertility
Decomposition
Delayed
Demographic aspects
Fertility
Fertility decline
fertility postponement
fertility recuperation
Fertility, Human
First born
low-fertility
Mothers
Research Article
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Summary:The rise in the age at first birth has been universal in low-fertility countries in the last decades. Mothers who have their first child later tend to have fewer children, and in the absence of fertility catch-up at older ages, delayed fertility contributes to cohort fertility decline. We aim to study how changes in completed cohort fertility (quantum) relate to delayed age at first birth (tempo) across birth cohorts. We use birth histories collected in surveys or censuses in ten high-income countries. We rely on a decomposition analysis that quantifies how much the changes in age at first birth, mothers' completed fertility conditional on age at first birth, and childlessness contribute to the total change in cohort fertility over the 1940-1969 birth cohorts. In many countries and cohorts, the fertility intensity of mothers increased more at later ages than at earlier ages, reflecting the catching up of those who had delayed childbearing. However, in most countries studied, the increased fertility intensity of mothers at older ages was not sufficient to offset the depressing effect of delayed first births on cohort fertility rates. Increased childlessness and delayed childbearing are important components of the fertility decline. The chances of a full fertility recovery in the future are minimal, given the inertia of mothers' completed fertility conditional on age at first birth across successive birth cohorts.
ISSN:1435-9871
2363-7064
1435-9871
DOI:10.4054/DEMRES.2023.48.15