Ultrasonography, PrenatalFetal DiseasesTwins, ConjoinedMusculoskeletal AbnormalitiesAbnormalities, MultiplePregnancyGestational AgePrenatal DiagnosisUltrasonographyAbortion, EugenicHydronephrosisPlacenta AccretaPregnancy Trimester, SecondPregnancy OutcomeIntestinal AtresiaAmniotic Band SyndromeInfant, NewbornLymphangiomaCongenital AbnormalitiesCesarean SectionPrenatal Exposure Delayed EffectsSyndromeUltrasonography, Doppler, ColorHernia, UmbilicalSpermatic Cord TorsionPrenatal CareFetal DeathPregnancy Trimester, FirstRetrospective StudiesDandy-Walker SyndromeUterine PerforationHernia, DiaphragmaticPlacenta PreviaSensitivity and SpecificityClubfootCystsProspective StudiesUterusKaryotypingPostnatal CareAnimals, NewbornUltrasonography, MammaryFetusPregnancy Trimester, ThirdReproducibility of ResultsAmniocentesisEchoencephalographyDelayed DiagnosisUltrasonography, DopplerEarly DiagnosisPredictive Value of TestsMaternal ExposureChorionic Villi SamplingPregnancy ComplicationsAbortion, TherapeuticFetal WeightDown SyndromePlacenta, RetainedBirth WeightFetal HeartImaging, Three-DimensionalOvarian CystsFetal DevelopmentTrisomyTime FactorsTomography, X-Ray ComputedDiagnosisDiagnostic ErrorsNeckRisk FactorsFollow-Up StudiesMagnetic Resonance ImagingAge FactorsPregnancy, High-RiskTorsion AbnormalityPolyhydramniosAbortion, InducedMaternal-Fetal ExchangeUmbilical CordAgingEmbryonic and Fetal DevelopmentTesticular DiseasesPrenatal InjuriesBiopsy