Gestational AgeInfant, Small for Gestational AgeInfant, NewbornPregnancyInfant, PrematureUltrasonography, PrenatalBirth WeightUltrasonographyUltrasonicsUltrasonic TherapyPremature BirthPregnancy OutcomePregnancy Trimester, SecondFetal Growth RetardationHigh-Intensity Focused Ultrasound AblationInfant, Premature, DiseasesUltrasonography, InterventionalPregnancy Trimester, ThirdInfant, Low Birth WeightFetusFetal DiseasesFetal DevelopmentPregnancy Trimester, FirstMicrobubblesProspective StudiesCrown-Rump LengthPregnancy ComplicationsUltrasonography, DopplerFetal HeartObstetric Labor, PrematureInfant, Very Low Birth WeightEchoencephalographyAmniotic FluidIntensive Care Units, NeonatalTerm BirthUltrasonography, Doppler, ColorSensitivity and SpecificityMaternal AgePrenatal DiagnosisTransducersRetrospective StudiesUmbilical ArteriesApgar ScoreTwinsFetal DeathReference ValuesRisk FactorsImaging, Three-DimensionalRetinopathy of PrematurityPlacentaFetal WeightInfant MortalityRespiratory Distress Syndrome, NewbornReproducibility of ResultsPre-EclampsiaChild DevelopmentDelivery, ObstetricCohort StudiesBlood Flow VelocityIntensive Care, NeonatalInfant, Newborn, DiseasesCesarean SectionHeadBronchopulmonary DysplasiaStillbirthEmbryonic and Fetal DevelopmentUltrasonography, Doppler, PulsedInfant, Extremely Low Birth WeightPredictive Value of TestsFetal MonitoringFetal MacrosomiaCongenital AbnormalitiesMicroscopy, AcousticHeart Rate, FetalFetal Membranes, Premature RuptureFetal Organ MaturityFetal BloodDevelopmental DisabilitiesInfant, Extremely PrematurePrenatal CareObserver VariationUmbilical CordChorioamnionitisParityContrast MediaEndosonographyPregnancy, MultipleFollow-Up StudiesAmniocentesisRegression AnalysisPregnancy TrimestersBody HeightTripletsBirth CertificatesFetal MortalityTime FactorsPubic SymphysisPregnancy, TwinFluorocarbonsAbortion, Spontaneous