French study reports maternal exposure to magnetic fields is not associated with adverse pregnancy outcomes

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This was a French cohort study investigating a possible relationship between maternal exposure to extremely low frequency magnetic fields (ELF MF) and the risk of moderate preterm birth or small size for gestational age at birth. The cohort included 18,329 infants born in 2011 from 33 weeks of gestation. The study examined the cumulative ELF MF exposure of the mothers both at home and at work. Exposure to participants was categorised at work by a job exposure matrix (JEM) and at home by previous measurements. The study reported no statistically significant association at any cumulative exposure level. The authors concluded that there was no evidence of an association between cumulative ELF MF exposure and moderate preterm birth or a baby being small for their gestational age at birth. 

Maternal cumulative exposure to extremely low frequency electromagnetic fields and pregnancy outcomes in the Elfe cohort

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A similar UK cohort study (de Vocht et al 2014) examined residential proximity to magnetic fields and the association with low birth weight and preterm birth. This study included 140356 births. The authors reported no statistically significant changes in either birth weight or rates of preterm birth associated with magnetic fields. A 2015 review by the Scientific Committee on Emerging and Newly Identified Health Risks concluded there is no evidence that fetal exposure to ELF magnetic fields is associated with adverse developmental outcomes.