DecelerationInfant, PrematureInfant, NewbornDiastoleEchocardiography, DopplerInfant, Premature, DiseasesInfant CareDrug Delivery SystemsAccelerationInfant FoodDelivery, ObstetricInfant FormulaHeart Rate, FetalInfant BehaviorEchocardiography, Doppler, PulsedMitral ValveInfant MortalityPregnancyVentricular Function, LeftBlood Flow VelocityInfant, Newborn, DiseasesVentricular Dysfunction, LeftSudden Infant DeathHeart SoundsInfant Nutritional Physiological PhenomenaFetal MonitoringInfant, Low Birth WeightInfant, Very Low Birth WeightTime FactorsContrecoup InjuryFetal DistressVentricular PressureCardiotocographyEchocardiographyStroke VolumeSystoleAtrial Function, LeftBreast FeedingGestational AgeInfant WelfareProspective StudiesBiomechanical PhenomenaBradycardiaHeart RateInfant, Extremely Low Birth WeightCesarean SectionMilk, HumanPhonocardiographyChild DevelopmentDrug CarriersSubarachnoid Hemorrhage, TraumaticInfant, Small for Gestational AgeBirth WeightVideo RecordingHeart VentriclesPulmonary VeinsDelivery of Health CareInfant, Extremely PrematureDemocratic Republic of the CongoPlay and PlaythingsHemodynamicsBottle FeedingCardiomyopathy, DilatedPredictive Value of TestsFollow-Up StudiesCoronary CirculationWounds, NonpenetratingGene Transfer TechniquesMovementNanoparticlesIntensive Care Units, NeonatalElectrocardiographyEchocardiography, Doppler, ColorHeart FailureUltrasonography, DopplerPregnancy OutcomePulmonary Wedge PressureMothersCryingGrowth DisordersRisk FactorsAnalysis of VarianceModels, CardiovascularMyocardial InfarctionCase-Control StudiesInfectious Disease Transmission, VerticalVentricular RemodelingPremature BirthUmbilical ArteriesCohort StudiesMyocardial ContractionCardiac CatheterizationAge FactorsPregnancy ComplicationsRetrospective StudiesRespiratory Distress Syndrome, NewbornTreatment OutcomeMitral Valve InsufficiencyHeart Failure, DiastolicReproducibility of Results