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The majority of Danish women are working, and many are standing/walking or lifting heavy objects at work. It is important for employers and employees to assess ergonomic risk factors in the work environment during pregnancy to avoid potential negative effects on the pregnancy. Studies show that walking/standing > 3-4 h/d may increase the risk of preterm delivery. It is difficult to set specific limits due to heterogenous exposures regarding heavy lifting. Though, results suggest that women should avoid lifting >10 kg repeatedly at work during pregnancy to avoid adverse effects of the pregnancy.