Folic AcidPregnancyFolic Acid DeficiencyNeural Tube DefectsPregnancy ComplicationsPregnancy OutcomePregnancy, AnimalTetrahydrofolatesDietary SupplementsHomocysteineFood, FortifiedVitamin B ComplexVitamin B 12Pregnancy, EctopicPreconception CareFolic Acid AntagonistsPregnancy Trimester, FirstPregnancy Trimester, ThirdPregnancy RateFolate Receptors, GPI-AnchoredPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPrenatal CarePregnancy in DiabeticsPregnancy, MultipleHyperhomocysteinemiaPregnancy Trimester, SecondAnemia, MacrocyticPregnancy, TubalHematinicsPregnancy Complications, HematologicVitamin B 6Pregnancy Complications, NeoplasticPregnancy in AdolescencePteroylpolyglutamic AcidsVitamin B 12 DeficiencyPregnancy Complications, InfectiousInfant, NewbornFolic Acid TransportersAbortion, SpontaneousVitaminsGestational AgeBreadPrenatal Nutritional Physiological PhenomenaPregnancy, UnplannedPregnancy ProteinsPregnancy, High-RiskPregnancy, UnwantedPre-EclampsiaPlacentaFetal DeathFlourFolate Receptor 1Methylenetetrahydrofolate Reductase (NADPH2)Spinal DysraphismPregnancy, ProlongedMaternal Nutritional Physiological PhenomenaPregnancy, TwinDouble-Blind MethodParityCongenital AbnormalitiesFormyltetrahydrofolatesPrenatal Exposure Delayed EffectsMaternal-Fetal ExchangeDietAminopterinAnencephalyMicronutrientsBirth WeightAbortion, InducedPregnancy, AbdominalUterusNutritional RequirementsPregnancy Complications, ParasiticPyridoxineMethotrexateLactationFIGLU TestPregnancy MaintenanceReduced Folate Carrier ProteinPterinsUltrasonography, PrenatalEmbryo ImplantationCerealsRisk FactorsFetal DevelopmentEmbryo TransferFertilization in VitroNutrition PolicyMethylmalonic AcidMaternal AgeNutritional StatusAbnormalities, Drug-InducedHomocystine4-Aminobenzoic AcidProspective StudiesFetal Growth RetardationPremature BirthRiboflavin