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Early Life BMI Trajectories and Associations With Childbirth and Infertility Among Women

JAMA Network Open 10.1001/jamanetworkopen.2026.26893

August 04, 2026 at 11:00 AM EDT

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In this cohort study of Danish women, associations with childbirth decreased from mid- to late-reproductive ages, when the window of fertility narrows. These findings suggest that childhood body size is associated with timing of childbirth, highlighting the importance of addressing women’s reproductive health early in the life course.

Corresponding Author: Jennifer L. Baker, PhD, Center for Clinical Research and Prevention, Frederiksberg Hospital, Nordre Fasanvej 57, 2000 Frederiksberg, Denmark (Jennifer.Lyn.Baker@regionh.dk).

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