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Umbilical VeinsUmbilical ArteriesInfant, PrematureInfant, NewbornInfant, Premature, DiseasesInfant CareInfant FoodHernia, UmbilicalInfant FormulaInfant BehaviorFetal BloodInfant, Newborn, DiseasesInfant MortalitySudden Infant DeathPregnancyHuman Umbilical Vein Endothelial CellsInfant Nutritional Physiological PhenomenaUmbilicusInfant, Very Low Birth WeightInfant, Low Birth WeightGestational AgeBreast FeedingInfant WelfareEndothelium, VascularCord Blood Stem Cell TransplantationInfant, Extremely Low Birth WeightInfant, Small for Gestational AgeUltrasonography, PrenatalChild DevelopmentMilk, HumanInfant, Extremely PrematureBirth WeightCells, CulturedEndothelial CellsFetal Growth RetardationBottle FeedingIntensive Care Units, NeonatalMaternal-Fetal ExchangeFetusCryingUltrasonography, DopplerSingle Umbilical ArteryMothersApgar ScorePlacental CirculationFetal DiseasesPregnancy OutcomeRespiratory Distress Syndrome, NewbornInfectious Disease Transmission, VerticalInfant Nutrition DisordersPlacentaProspective StudiesIntensive Care, NeonatalBronchopulmonary DysplasiaTime FactorsBlood Flow VelocityUrachal CystDevelopmental DisabilitiesHeart Rate, FetalFetal HypoxiaFetal DistressIncubators, InfantPregnancy ComplicationsCesarean SectionInfant EquipmentPregnancy Trimester, ThirdFetal DeathPregnancy Complications, InfectiousDiarrhea, InfantileApneaEnterocolitis, NecrotizingMother-Child RelationsBlood BanksNeonatal ScreeningDelivery, ObstetricAsphyxia NeonatorumFetal MonitoringMaternal BehaviorSucking BehaviorTerm BirthRisk FactorsRetrospective StudiesWharton JellyRetinopathy of PrematurityCell AdhesionPremature BirthPulsatile FlowNeovascularization, PhysiologicCongenital AbnormalitiesGrowthEndotheliumUltrasonography, Doppler, PulsedProne PositionFollow-Up StudiesMaternal AgePrenatal Exposure Delayed EffectsAge FactorsCohort StudiesMesenchymal Stromal CellsLeukomalacia, Periventricular