Cardiovascular Physiological PhenomenaFetal HeartDental Physiological PhenomenaDigestive System and Oral Physiological PhenomenaReproductive and Urinary Physiological PhenomenaMusculoskeletal and Neural Physiological PhenomenaCirculatory and Respiratory Physiological PhenomenaIntegumentary System Physiological PhenomenaSports Nutritional Physiological PhenomenaEchocardiography, Four-DimensionalReproductive Physiological PhenomenaPhysiological PhenomenaElder Nutritional Physiological PhenomenaUltrasonography, PrenatalUrinary Tract Physiological PhenomenaHeart Defects, CongenitalFetal DiseasesMusculoskeletal Physiological PhenomenaPregnancyGestational AgeFetoscopyMagnetocardiographyMyocytes, CardiacFetoscopesHeart Rate, FetalCardiac VolumeRhabdomyomaPregnancy Trimester, SecondHeartVirus Physiological PhenomenaEchocardiography, Three-DimensionalCardiac OutputDigestive System Physiological PhenomenaCardiac Surgical ProceduresPlacental InsufficiencyHeart VentriclesUmbilical ArteriesFetusEchocardiographyBlood Physiological PhenomenaCardiomegalyFetal MonitoringPregnancy Trimester, FirstEchocardiography, Doppler, ColorVentricular FunctionMyocardial ContractionCardiotocographyVentricular DysfunctionArrhythmias, CardiacPregnancy Trimester, ThirdAdolescent Nutritional Physiological PhenomenaHeart BlockMyocardiumDeath, Sudden, CardiacHeart NeoplasmsOcular Physiological PhenomenaHydrops FetalisCardiomyopathiesNervous System Physiological PhenomenaFetofetal TransfusionImage Interpretation, Computer-AssistedDuctus ArteriosusFetal DevelopmentEchocardiography, DopplerCell Physiological PhenomenaRespiratory Physiological PhenomenaSkin Physiological PhenomenaPrenatal Nutritional Physiological PhenomenaHypoplastic Left Heart SyndromePlant Physiological PhenomenaBlood Flow VelocityProspective StudiesPregnancy in DiabeticsSheepFeasibility StudiesBacterial Physiological PhenomenaHeart RateUltrasonography, DopplerCardiac Pacing, ArtificialCardiac TamponadeCrown-Rump LengthHeart DiseasesReproducibility of ResultsCardiac CatheterizationPregnancy OutcomePrenatal DiagnosisObserver VariationMaternal Nutritional Physiological PhenomenaPulmonary ArterySensitivity and SpecificityHeart ArrestChild Nutritional Physiological PhenomenaMaternal-Fetal ExchangeTime FactorsReference ValuesNutritional Physiological PhenomenaOrgan SizeRetrospective StudiesInfant Nutritional Physiological PhenomenaElectrocardiography