Ultrasonography, PrenatalFetal DiseasesPregnancyHydronephrosisPrenatal CarePrenatal DiagnosisUltrasonographyInfant, NewbornPrenatal Exposure Delayed EffectsGestational AgePregnancy Complications, InfectiousUltrasonography, Doppler, ColorRetrospective StudiesUltrasonography, DopplerEndosonographyUltrasonography, Doppler, DuplexUltrasonography, Doppler, PulsedUltrasonography, MammarySensitivity and SpecificityUltrasonography, InterventionalUltrasonography, Doppler, TranscranialProspective StudiesAmniocentesisFetusMaternal ExposurePregnancy Trimester, SecondChorionic Villi SamplingTomography, X-Ray ComputedSulfur HexafluorideAbortion, EugenicPregnancy OutcomeReproducibility of ResultsContrast MediaPredictive Value of TestsPregnancy ComplicationsImaging, Three-DimensionalPregnancy Trimester, ThirdUrographyScrotumPrenatal InjuriesFetal DevelopmentBlood Flow VelocityMagnetic Resonance ImagingPregnancy Trimester, FirstCystsRisk FactorsEchoencephalographyCongenital AbnormalitiesFollow-Up StudiesAbnormalities, MultipleBirth WeightFetal DeathFetal HeartAbortion, TherapeuticAbdomenMaternal-Fetal ExchangeFetal Alcohol Spectrum DisordersPreoperative CarePalpationCarotid Artery DiseasesTime FactorsAbortion, InducedOvarian CystsVaginaTreatment OutcomeGenetic CounselingFalse Positive ReactionsObserver VariationThyroid NoduleMaternal-Fetal RelationsCarotid ArteriesToe JointGallbladderImage EnhancementPregnant WomenPolyhydramniosLiver NeoplasmsMetacarpophalangeal JointMaternal AgeDown SyndromeDiagnostic ImagingCohort StudiesAbdominal InjuriesChromosome DisordersPregnancy, High-RiskLymphangioma, CysticSplenic DiseasesTesticular DiseasesMothersInfant, Low Birth WeightAuscultation