Fetal BloodCordocentesisFetusPregnancyMaternal-Fetal ExchangeBlood Transfusion, IntrauterineFetomaternal TransfusionFetal DiseasesRh IsoimmunizationErythroblastosis, FetalPlacentaFetoscopyAmniotic FluidHeart Rate, FetalPrenatal DiagnosisFetal HypoxiaGestational AgeHydrops FetalisSheepUmbilical ArteriesBlood Specimen CollectionPlacental CirculationFetal Growth RetardationPregnancy Trimester, ThirdFetal WeightPregnancy, AnimalUmbilical CordCardiotocographyUltrasonography, PrenatalFetal DeathFetal Stem CellsVitamin K Deficiency BleedingPregnancy Trimester, SecondBlood Gas AnalysisLabor, ObstetricFetal HemoglobinHemoglobinopathiesErythema InfectiosumUltrasonography, DopplerInfant, NewbornFetal HeartAmniocentesisAcidosisAnesthesia, ObstetricalFetofetal TransfusionUmbilical VeinsFetal DevelopmentErythrocyte CountBlood Flow VelocityChorionic VilliErythroblastsPregnancy Trimester, FirstEmbryonic and Fetal DevelopmentUterusPulsatile FlowHematocritOxygenUltrasonographyCesarean SectionCarbon DioxideHemoglobinsBlood VolumeTrophoblastsAdrenocorticotropic HormoneHematopoietic Stem CellsModels, AnimalRegional Blood FlowHydrogen-Ion ConcentrationBlood PressureHydrocortisoneThymus GlandErythrocytesReference ValuesBlood GlucoseLiverMice, Inbred C57BLT-Lymphocytes