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Prenatal Exposure Delayed EffectsPrenatal DiagnosisPrenatal CarePregnancyUltrasonography, PrenatalSampling StudiesFetal DiseasesChorionic Villi SamplingInfant, NewbornMaternal ExposureAmniocentesisGestational AgeAbortion, EugenicFetusPrenatal InjuriesPregnancy OutcomePregnancy ComplicationsPregnancy Trimester, SecondMaternal-Fetal ExchangeEnvironmental MonitoringFetal Alcohol Spectrum DisordersSpecimen HandlingFetal DevelopmentGenetic CounselingBirth WeightBlood Specimen CollectionPregnant WomenPregnancy Trimester, ThirdFetal DeathMothersAbnormalities, MultipleMaternal AgeMaternal BehaviorCongenital AbnormalitiesPregnancy Trimester, FirstDown SyndromeHeterozygote DetectionAbortion, TherapeuticInfant, Low Birth WeightTime FactorsAbortion, InducedSensitivity and SpecificityChromosome DisordersMaternal-Fetal RelationsRisk FactorsReproducibility of ResultsPetrosal Sinus SamplingAir MicrobiologyGenetic TestingTrisomyPregnancy TrimestersChild DevelopmentFetal BloodPrenatal EducationAlgorithmsSample SizePregnancy Complications, InfectiousLot Quality Assurance SamplingSeychellesProspective StudiesQuestionnairesHydrops FetalisPrevalencePolyhydramniosAir Pollutants, OccupationalCohort StudiesPregnancy, High-RiskComputer SimulationMethylmercury CompoundsKaryotypingTestosterone PropionateSocioeconomic FactorsFetal HeartRetrospective StudiesCross-Sectional StudiesFetal Nutrition DisordersEnvironmental PollutantsEthanolFetal Growth RetardationEnvironmental ExposurePerinatologyAnalysis of VarianceBrazilObstetricsInfant BehaviorModels, StatisticalCocaineBrainMonte Carlo MethodSeasonsUnited StatesHeart Defects, CongenitalBetamethasoneSheepAbnormalities, Drug-InducedSex CharacteristicsEmbryonic and Fetal DevelopmentBody WeightPerinatal CareLongitudinal Studies