Fetal DeathFetal MortalityPregnancyGestational AgeCause of DeathCell DeathPregnancy OutcomeStillbirthTwinsInfant, NewbornMaternal AgePregnancy ComplicationsAbruptio PlacentaePregnancy, MultipleAbortion, SpontaneousUltrasonography, PrenatalBirth WeightPregnancy Trimester, SecondInfant MortalityPremature BirthDeath CertificatesFetal Growth RetardationHydrops FetalisColaDeathBirth CertificatesPlacenta DiseasesPlacentaCongenital AbnormalitiesPerinatal MortalityPregnancy, High-RiskInfant, Small for Gestational AgePregnancy Trimester, ThirdPregnancy Trimester, FirstPregnancy Complications, InfectiousObstetric Labor, PrematurePlacental Function TestsFetal DiseasesAborted FetusTripletsCesarean SectionRisk FactorsInfant, Low Birth WeightParityAmniotic FluidAmniocentesisFetusPre-EclampsiaCohort StudiesFetal MonitoringFetal ResorptionDelivery, ObstetricAgrochemicalsAbortion, InducedParvovirus B19, HumanParvoviridae InfectionsPregnancy Complications, CardiovascularMaternal-Fetal ExchangePlacental CirculationRetrospective StudiesFetal DevelopmentPrenatal DiagnosisFetofetal TransfusionPregnancy, TwinTwins, MonozygoticSex RatioReproductive Techniques, AssistedNeosporaMaternal ExposureLive BirthDeath, Sudden, CardiacAutopsyAbnormalities, Drug-InducedHELLP SyndromeCoccidiosisVital StatisticsDenmarkProspective StudiesApgar ScoreFetal HeartBrain DeathHazardous WasteChorioamnionitisMultiple Birth OffspringRegistriesFertilization in VitroMandatory ReportingUnited StatesTime FactorsPrenatal CareDiseases in TwinsObstetric Labor ComplicationsFetal WeightCrown-Rump LengthExpressed Sequence TagsNew YorkPregnancy Complications, HematologicInfant, PrematureAbortifacient Agents, NonsteroidalEmbryo Transfer