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The Effect of Childhood Family Size on Fertility in Adulthood: New Evidence From IV Estimation

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  • Sara Cools

    (Institute for Social Research)

  • Rannveig Kaldager Hart

    (University of Oslo
    Statistics Norway)

Abstract

Although fertility is positively correlated across generations, the causal effect of children’s experience with larger sibships on their own fertility in adulthood is poorly understood. With the sex composition of the two firstborn children as an instrumental variable, we estimate the effect of sibship size on adult fertility using high-quality data from Norwegian administrative registers. Our study sample is all firstborns or second-borns during the 1960s in Norwegian families with at least two children (approximately 110,000 men and 104,000 women). An additional sibling has a positive effect on male fertility, mainly causing them to have three children themselves, but has a negative effect on female fertility at the same margin. Investigation into mediators reveals that mothers of girls shift relatively less time from market to family work when an additional child is born. We speculate that this scarcity in parents’ time makes girls aware of the strains of life in large families, leading them to limit their own number of children in adulthood.

Suggested Citation

  • Sara Cools & Rannveig Kaldager Hart, 2017. "The Effect of Childhood Family Size on Fertility in Adulthood: New Evidence From IV Estimation," Demography, Springer;Population Association of America (PAA), vol. 54(1), pages 23-44, February.
    • Handle: RePEc:spr:demogr:v:54:y:2017:i:1:d:10.1007_s13524-016-0537-z
    DOI: 10.1007/s13524-016-0537-z
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    3. Eva Beaujouan & Anne Solaz, 2019. "Is the Family Size of Parents and Children Still Related? Revisiting the Cross-Generational Relationship Over the Last Century," Demography, Springer;Population Association of America (PAA), vol. 56(2), pages 595-619, April.
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    7. Janna Bergsvik & Sara Cools & Rannveig K. Hart, 2020. "Explaining residential clustering of fertility," Discussion Papers 939, Statistics Norway, Research Department.
    8. Janna Bergsvik, 2019. "Linking neighbors’ fertility. Third births in Norwegian neighborhoods," Discussion Papers 898, Statistics Norway, Research Department.
    9. Guber, Raphael, 2018. "Instrument Validity Tests with Causal Trees: With an Application to the Same-sex Instrument," MEA discussion paper series 201805, Munich Center for the Economics of Aging (MEA) at the Max Planck Institute for Social Law and Social Policy.
    10. Kathrin Morosow & Martin Kolk, 2020. "How Does Birth Order and Number of Siblings Affect Fertility? A Within-Family Comparison Using Swedish Register Data," European Journal of Population, Springer;European Association for Population Studies, vol. 36(2), pages 197-233, April.
    11. Janna Bergsvik & Sara Cools & Rannveig K. Hart, 2023. "Explaining Residential Clustering of Large Families," European Journal of Population, Springer;European Association for Population Studies, vol. 39(1), pages 1-28, December.

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