TNF and preeclampsia: IL‐1β is involved in implantation and preimplantation embryo development53 with elevated first trimester IL‐1β associated with preterm preeclampsia.54 Contrary to our findings, IL‐1β and TNF‐α were previously shown to be positively associated with MeHg in a mother‐child cohort20 albeit measurements were taken at delivery, a time in pregnancy when proinflammatory markers would be increased by labour.