Prenatal CarePrenatal DiagnosisPregnancyUltrasonography, PrenatalFetal DiseasesPregnancy Complications, InfectiousPrenatal Exposure Delayed EffectsInfant, NewbornMaternal ExposureGestational AgeAmniocentesisChorionic Villi SamplingAbortion, EugenicFetusPrenatal InjuriesPregnancy OutcomePregnancy ComplicationsPregnancy Trimester, SecondMaternal-Fetal ExchangeDiagnostic Tests, RoutineFetal Alcohol Spectrum DisordersFetal DevelopmentGenetic CounselingBirth WeightPregnant WomenPregnancy Trimester, ThirdAbnormalities, MultipleFetal DeathMothersSensitivity and SpecificityMaternal AgeCongenital AbnormalitiesProspective StudiesMaternal BehaviorAbortion, TherapeuticHeterozygote DetectionRetrospective StudiesInfant, Low Birth WeightAbortion, InducedPregnancy Trimester, FirstGenetic TestingRisk FactorsDown SyndromeMaternal-Fetal RelationsChild DevelopmentChromosome DisordersTrisomyCohort StudiesPrenatal EducationPregnancy TrimestersTime FactorsSeychellesPolyhydramniosFetal BloodPregnancy, High-RiskKaryotypingFetal HeartHeart Defects, CongenitalMass ScreeningQuestionnairesMethylmercury CompoundsHydrops FetalisReproducibility of ResultsObstetricsTestosterone PropionateInfant BehaviorFetal Nutrition DisordersFollow-Up StudiesUnited StatesPerinatologyFetal Growth RetardationPerinatal CarePostnatal CareBetamethasoneEthanolEmbryonic and Fetal DevelopmentCocaineAbnormalities, Drug-InducedPolymerase Chain ReactionEnvironmental PollutantsSocioeconomic FactorsToxoplasmosis, CongenitalMaternal Health ServicesMusculoskeletal AbnormalitiesChromosome AberrationsDevelopmental DisabilitiesHydronephrosisSex CharacteristicsMaternal Nutritional Physiological PhenomenaAge FactorsTwins, ConjoinedAneuploidyStress, PsychologicalPrevalenceBrainCordocentesisSex Determination AnalysisLongitudinal StudiesPremature BirthInfant Mortality