Umbilical ArteriesSingle Umbilical ArteryUmbilical VeinsUltrasonography, PrenatalUltrasonography, DopplerFetal Growth RetardationPlacental CirculationArteriesVeinsPregnancyHeart Rate, FetalBlood Flow VelocityGestational AgeUltrasonography, Doppler, PulsedUmbilical CordFetal DistressPulsatile FlowSaphenous VeinFetal MonitoringPlacental InsufficiencyFetusCerebral ArteriesUltrasonography, Doppler, ColorFetal DiseasesPortal VeinPulmonary ArteryPregnancy OutcomeFetal BloodInfant, NewbornPregnancy Trimester, ThirdMiddle Cerebral ArteryVaricose VeinsCarotid ArteriesFemoral ArteryPlacentaRenal ArteryFemoral VeinUterine ArteryPregnancy Trimester, SecondPulmonary VeinsFetal HypoxiaMesenteric ArteriesHernia, UmbilicalEndothelium, VascularFetofetal TransfusionFetal HeartBasilar ArteryJugular VeinsHallermann's SyndromePre-EclampsiaPregnancy, High-RiskProspective StudiesInfant, Small for Gestational AgeRegional Blood FlowIliac ArteryHuman Umbilical Vein Endothelial CellsDigestive System AbnormalitiesApgar ScoreFetal DeathVertebral ArteryCoronary Artery BypassPregnancy Trimester, FirstMammary ArteriesMuscle, Smooth, VascularRadial ArteryPlacenta DiseasesUterusVascular ResistanceMesenteric VeinsRenal VeinsCarotid Artery, InternalSubclavian ArteryFetal WeightCardiotocographyIliac VeinCesarean SectionMaternal-Fetal ExchangeCarotid Artery DiseasesUmbilicusSplenic ArteryHepatic ArteryCells, CulturedBrachial ArteryEndothelial CellsChorionHepatic VeinsAbnormalities, MultipleUltrasonographyCarotid Artery, CommonCoronary VesselsDihydralazinePregnancy, ProlongedReference ValuesLaser-Doppler FlowmetryVasoconstrictionCardiovascular AbnormalitiesPopliteal VeinBlood CirculationFetal MovementCatheterization, Peripheral