Millions of Americans walk, lift and lean through a shift without a second thought.
One small movement, repeated through the day, had never really been counted.
For every extra hour a pregnant woman spent bent forward at work, her risk of miscarriage rose by 36 percent, researchers reported in Occupational and Environmental Medicine in July 2026.
Walking at work carried a smaller rise, about 18 percent per hour. Standing added only about 3 percent per hour. Forward bending stood out as the heaviest exposure of the three.
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The average worker in the study spent only 24 minutes a day in that posture. That keeps the absolute risk low for most women.
About 10 percent of pregnancies in the study ended in miscarriage, rising to roughly 14 percent for women who spent a full hour a day bent forward.
The study was observational, so it cannot prove the posture itself caused the losses.
The authors say the pattern needs checking in other countries and alongside factors such as smoking and overall health.
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Why bending forward might harm a pregnancy is not yet clear. One possibility, researchers at the University of Copenhagen suggest, is that the posture limits blood flow to the placenta. It could also trigger stress hormones that make the uterus contract.
Where the risk adds up fastest
Forward-bending work is routine in home health, nursing, waitressing, retail stocking, warehouse picking, farming and many trades. In those jobs there is often no option to sit, and short bends over beds, shelves or tray stacks pile up through the day.
The authors stressed that the full-hour threshold is rare in practice. Most workers in the study did not come anywhere near a full hour of forward bending each day.
What pregnant workers in the US can request
The federal Pregnant Workers Fairness Act requires employers with at least 15 staff to offer reasonable accommodations during pregnancy. The final implementing rule from the US Equal Employment Opportunity Commission took effect on June 18, 2024.
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That rule lists frequent breaks, a chair to alternate sitting and standing, light duty, temporary job restructuring and leave among the standard adjustments.
A pregnant worker can put the request to her employer in writing and name the specific tasks that worry her. The employer must consider it unless the change would create an undue hardship on the business.
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This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.