Association between prenatal exposure to cooking oil fumes and full-term low birth weight is mediated by placental weight.

•Prenatal COF exposure was associated with FT-LBW and placental weight.•Pregnant women cook more frequently or longer showed a higher risk of FT-LBW.•Different cooking methods during pregnancy were associated with FT-LBW risks.•Placental weight mediated the associations of prenatal COF exposure with FT-LBW.