Date	Event	Description
12 July 2018	New search has been performed	Search updated.
12 July 2018	New citation required and conclusions have changed	Supplementation with vitamin D alone (22 trials in total, 13 new trials added in this update) during pregnancy probably reduces the risk of pre‐eclampsia, gestational diabetes and low birthweight. Supplementation with vitamin D + calcium (9 trials in total, three new trials added in this update) during pregnancy probably reduces the risk of pre‐eclampsia but may increase the risk of preterm births. Supplementation with vitamin D + other nutrients (1 trial trial added in this update) in pregnancy may make little or no difference in the risk of preterm birth or low birthweight. In general, more data are needed to conclude about the risk of maternal adverse events.