Fetal BloodCordocentesisFetusPregnancyMaternal-Fetal ExchangeBlood Transfusion, IntrauterineFetomaternal TransfusionFetal DiseasesRh IsoimmunizationErythroblastosis, FetalPlacentaFetoscopyAmniotic FluidHeart Rate, FetalPrenatal DiagnosisGestational AgeFetal HypoxiaHydrops FetalisSheepBlood Specimen CollectionUmbilical ArteriesPlacental CirculationFetal Growth RetardationPregnancy Trimester, ThirdPregnancy, AnimalFetal WeightUmbilical CordCardiotocographyUltrasonography, PrenatalFetal DeathFetal Stem CellsVitamin K Deficiency BleedingPregnancy Trimester, SecondBlood Gas AnalysisLabor, ObstetricFetal HemoglobinHemoglobinopathiesErythema InfectiosumInfant, NewbornUltrasonography, DopplerFetal HeartAmniocentesisAcidosisAnesthesia, ObstetricalFetofetal TransfusionUmbilical VeinsFetal DevelopmentErythrocyte CountBlood Flow VelocityChorionic VilliErythroblastsPregnancy Trimester, FirstEmbryonic and Fetal DevelopmentUterusOxygenHematocritPulsatile FlowUltrasonographyCarbon DioxideHemoglobinsCesarean SectionHydrogen-Ion ConcentrationBlood VolumeTrophoblastsAdrenocorticotropic HormoneHematopoietic Stem CellsModels, AnimalRegional Blood FlowBlood PressureHydrocortisoneErythrocytesThymus GlandLiverReference ValuesBlood GlucoseMice, Inbred C57BLT-Lymphocytes