FetusFetal BloodGestational AgePregnancyBone and BonesCordocentesisMaternal-Fetal ExchangeRNA, MessengerFetal Tissue TransplantationPlacentaComplicityBone RemodelingAborted FetusFetal DiseasesBlood Transfusion, IntrauterineBone DensityAmniotic FluidFetomaternal TransfusionDirected Tissue DonationHydrops FetalisRh IsoimmunizationErythroblastosis, FetalBone ResorptionPrenatal DiagnosisPregnancy, AnimalLifeBone MarrowFetoscopySheepHeart Rate, FetalPersonhoodAbortion, VeterinaryBeginning of Human LifeFetal WeightBone NeoplasmsFetal HypoxiaBone DevelopmentBone Marrow CellsFetal DeathBone DiseasesFetal Growth RetardationBlood Specimen CollectionUmbilical ArteriesUmbilical CordBone RegenerationPregnancy Trimester, SecondFetal ResearchEmbryonic and Fetal DevelopmentPlacental CirculationChorionic VilliFetal DevelopmentBone MatrixPregnancy Trimester, ThirdBone Marrow TransplantationUltrasonography, PrenatalBone TransplantationCardiotocographyCivil RightsUterusPregnancy Trimester, FirstFetal Stem CellsVitamin K Deficiency BleedingPregnant WomenBlood Gas AnalysisInfant, NewbornLiverTrophoblastsAbortion, InducedBone SubstitutesLabor, ObstetricBone Diseases, MetabolicBrain Tissue TransplantationFractures, BoneTherapeutic Human ExperimentationFetal HemoglobinHemoglobinopathiesExtraembryonic MembranesNontherapeutic Human ExperimentationErythema InfectiosumBone Morphogenetic ProteinsFetal ResorptionTissue DistributionUltrasonography, DopplerFetal HeartSocial Control, FormalAmniocentesisBone Morphogenetic Protein 2AcidosisHematopoietic Stem CellsOsteogenesisAnesthesia, ObstetricalTemporal BoneFetofetal TransfusionUmbilical VeinsAbortion, LegalErythroblastsErythrocyte CountEthics, MedicalParietal BoneBlood Flow Velocity