Birth WeightPremature BirthBirth RateInfant, Low Birth WeightInfant, NewbornPregnancyBirth OrderBirth CertificatesBirth IntervalsConfidence IntervalsRisk FactorsGestational AgeCohort StudiesPregnancy OutcomeTime FactorsProspective StudiesBirth InjuriesMaternal AgeOdds RatioCongenital AbnormalitiesMultiple Birth OffspringCase-Control StudiesInfant MortalityParityRetrospective StudiesFollow-Up StudiesLogistic ModelsIncidencePregnancy ComplicationsDelivery, ObstetricAge FactorsInfant, Small for Gestational AgeUnited StatesVaginal Birth after CesareanTreatment OutcomeAnimals, NewbornMaternal ExposurePrenatal CarePrevalenceRiskFetal DeathRisk AssessmentPrenatal Exposure Delayed EffectsMultivariate AnalysisRegression AnalysisCesarean SectionHome ChildbirthMothersObstetric Labor, PrematureRegistriesLongitudinal StudiesSocioeconomic FactorsSex FactorsElectrocardiographyMidwiferyStillbirthChild DevelopmentPerinatal CareCross-Sectional StudiesFetal DevelopmentProportional Hazards ModelsInfant, Premature, DiseasesQuestionnairesBody HeightBody WeightBreast FeedingSmokingDenmarkLinear ModelsPregnancy, MultipleGenotypeApgar ScoreObstetric Labor ComplicationsSwedenPredictive Value of TestsPrognosisReference ValuesEuropean Continental Ancestry GroupLabor, ObstetricWeaningPaternal AgeAnalysis of VarianceWeight GainBody Mass IndexSex RatioSeasonsPregnancy in AdolescenceEducational StatusAsphyxia NeonatorumIntensive Care Units, NeonatalReproducibility of ResultsPregnancy Complications, InfectiousHeart RateSensitivity and SpecificitySurvival AnalysisAbortion, SpontaneousFetusConfounding Factors (Epidemiology)Perinatal MortalityLong QT Syndrome