Electronic search strategies Search Pubmed: ((“Vegetarians”[MeSH] OR “Diet, Vegetarian”[MeSH] OR “Vegans”[MeSH] OR “Diet, Vegan”[MeSH] OR vegan*[tiab] OR vegetarian*[tiab] OR plant-base*[tiab] OR plantbase*[tiab])) AND (((“Pregnancy Outcome”[Mesh] OR maternal outcome*[tiab] OR “Diabetes, Gestational”[Mesh] OR “Hypertension, Pregnancy-Induced”[Mesh] OR “Pre- Eclampsia”[Mesh] OR “HELLP Syndrome”[Mesh] OR “Anemia”[Mesh] OR “Fetal Growth Retardation”[Mesh] OR “Fetal Macrosomia”[Mesh] OR “Infant, Low Birth Weight”[Mesh] OR “gestational diabetes*”[tiab] OR “high blood pressure*”[tiab] OR pre-eclampsia*[tiab] OR preeclampsia*[tiab] OR toxemia*[tiab] OR macrosomia*[tiab] OR anemia*[tiab] OR anaemia*[tiab]) OR (fetal*[tiab] OR fetus*[tiab] OR foetus*[tiab] OR embryo*[tiab]) AND (grow*[tiab] OR size*[tiab] OR develop*[tiab] OR outcome*[tiab]) OR (ctal*[tiab] OR newborn*[tiab] OR birth*[tiab]) AND (size*[tiab] OR weight*[tiab] OR birthweight[tiab] OR develop*[tiab] OR outcome*[tiab])) OR ((intra-uterine[tiab] OR intrauterine[tiab]) AND (grow*[tiab] OR develop*[tiab]))) Search Embase: (exp vegetarian/or exp vegetarian diet/or exp vegan diet/OR exp vegan/OR vegan*.ti,ab,kw. OR vegetarian*.ti,ab,kw. OR plant-base*.ti,ab,kw. OR plantbase*.ti,ab,kw.) AND (exp pregnancy outcome/OR exp pregnancy diabetes mellitus/OR exp maternal hypertension/OR exp hellp syndrome/OR exp preeclampsia/OR exp”eclampsia and preeclampsia”/OR exp anemia/OR exp intrauterine growth retardation/OR exp macrosomia/OR exp low birth weight/OR maternal outcome*.ti,ab,kw. OR “pregnancy diabetes melitus”*.ti,ab,kw. OR hypertensi*.ti,ab,kw. OR “high blood pressure”*.ti,ab,kw. OR pre-eclampsia*.ti,ab,kw. OR preeclampsia*.ti,ab,kw. OR toxemia*.ti,ab,kw. OR macrosomia*.ti,ab,kw. OR anemia*.ti,ab,kw. OR anaemia*.ti,ab,kw. OR ((fetal*.ti,ab,kw. OR fetus*.ti,ab,kw. OR foetus*.ti,ab,kw. OR embryo*.ti,ab,kw.) AND (grow*.ti,ab,kw. OR size*.ti,ab,kw. OR develop*.ti,ab,kw. OR outcome*.ti,ab,kw.)) OR ((neonatal*.ti,ab,kw. OR newborn*.ti,ab,kw. OR birth*.ti,ab,kw.) AND (size*.ti,ab,kw. OR weight*.ti,ab,kw. OR birthweight*.ti,ab,kw. OR develop*.ti,ab,kw. OR outcome*.ti,ab,kw.)) OR ((intra-uterine.ti,ab,kw. OR intrauterine.ti,ab,kw.) AND (grow*.ti,ab,kw. OR develop*.ti,ab,kw.))) Search Cochrane: (MeSH descriptor: [Vegans] explode all trees OR MeSH descriptor: [Vegetarians] explode all trees OR MeSH descriptor: [Diet, Vegan] explode all trees OR MeSH descriptor: [Diet, Vegetarian] explode all trees OR vegan* OR vegetarian* OR plant- base* OR plantbase*) AND MeSH descriptor: [Pregnancy Outcome] explode all trees OR MeSH descriptor: [Diabetes, Gestational] explode all trees OR MeSH descriptor: [Hypertension, Pregnancy-Induced] explode all trees OR MeSH descriptor: [Pre-Eclampsia] explode all trees OR MeSH descriptor: [HELLP Syndrome] explode all trees OR MeSH descriptor: [Anemia] explode all trees OR MeSH descriptor: [Fetal Growth Retardation] explode all trees OR MeSH descriptor: [Fetal Macrosomia] explode all trees OR MeSH descriptor: [Infant, Low Birth Weight] explode all trees OR gestational diabetes* OR high blood pressure* OR pre- eclampsia* OR preeclampsia* OR toxemia* or macrosomia* OR anemia* OR anaemia* OR ((fetal* OR fetus* OR foetus* OR embryo*) AND (grow* OR size* OR develop* OR outcome*)) OR ((neonatal* OR newborn* OR birth*) AND (size* OR weight* OR birthweight* OR outcome*)) OR ((intra-uterine* OR intrauterine*) AND (grow* OR develop*)