Maternal AgeGestational AgeInfant, NewbornPregnancyInfant, Small for Gestational AgeBirth WeightPremature BirthInfant, PrematureInfant, Low Birth WeightPregnancy OutcomeObstetric Labor, PrematureInfant, Premature, DiseasesBirth OrderUltrasonography, PrenatalPregnancy ComplicationsPregnancy, High-RiskBirth CertificatesPregnancy Trimester, SecondDown SyndromeParityPaternal AgePregnancy Trimester, FirstBirth RateInfant MortalityAmniocentesisFetal Growth RetardationTerm BirthRisk FactorsCongenital AbnormalitiesFetal DeathPregnancy Trimester, ThirdPrenatal DiagnosisCrown-Rump LengthFetal Membranes, Premature RuptureInfant, Very Low Birth WeightCesarean SectionFetusDelivery, ObstetricStillbirthFetal DevelopmentIntensive Care Units, NeonatalCohort StudiesAmniotic FluidPrenatal CareProspective StudiesPregnancy, MultipleFetal DiseasesApgar ScoreChorioamnionitisAbortion, SpontaneousChild DevelopmentTwinsMothersPre-EclampsiaRespiratory Distress Syndrome, NewbornInfant, Extremely PrematureRetrospective StudiesBronchopulmonary DysplasiaPerinatal MortalityBirth IntervalsMaternal ExposurePlacentaIntensive Care, NeonatalRetinopathy of PrematurityDevelopmental DisabilitiesPrenatal Exposure Delayed EffectsTrisomyLogistic ModelsMultiple Birth OffspringPerinatal CareNuchal Translucency MeasurementLabor, ObstetricFetal BloodFetal MacrosomiaCase-Control StudiesTripletsInfant, Newborn, DiseasesRegression AnalysisPregnancy, TwinBody HeightPregnancy Complications, InfectiousObstetric Labor ComplicationsChromosome DisordersOdds RatioInfant CareLive BirthReference ValuesFetal HeartBreast FeedingHypertension, Pregnancy-InducedTocolytic AgentsNondisjunction, GeneticAneuploidyGastroschisisChorionic Gonadotropin, beta Subunit, HumanLabor, InducedInfant, Extremely Low Birth WeightFetal MortalityRegistriesSocioeconomic Factors