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Premature BirthObstetric Labor, PrematurePregnancyInfant, PrematureInfant, NewbornBirth WeightGestational AgeInfant, Low Birth WeightPregnancy OutcomeFetal Membranes, Premature RuptureCerclage, CervicalInfant, Premature, DiseasesBirth RatePregnancy ComplicationsInfant, Small for Gestational AgeUterine Cervical IncompetenceChorioamnionitisRisk FactorsCervical Length MeasurementInfant MortalityBirth CertificatesTerm BirthStillbirthCervix UteriTocolytic AgentsInfant, Extremely PrematurePrenatal CarePregnancy Trimester, SecondPregnancy, High-RiskMaternal AgeCohort StudiesPregnancy Complications, InfectiousFetal DeathPrimary PreventionAmniotic FluidPregnancy, MultipleBirth OrderProspective StudiesBirth IntervalsDelivery, ObstetricParityLogistic ModelsPerinatal CareAdministration, IntravaginalCesarean SectionRespiratory Distress Syndrome, NewbornInfant, Very Low Birth WeightMaternal ExposureHydroxyprogesteronesDevelopmental DisabilitiesMultiple Birth OffspringUnited StatesCongenital AbnormalitiesVaginosis, BacterialBronchopulmonary DysplasiaOdds RatioCervical RipeningPregnancy Trimester, ThirdFetal Growth RetardationIntensive Care Units, NeonatalLabor, InducedChild DevelopmentIntensive Care, NeonatalMothersTwinsSocioeconomic FactorsPre-EclampsiaTocolysisExtraembryonic MembranesInfant CarePregnancy, TwinProgestinsParturitionPessariesLabor, ObstetricRetrospective StudiesVital StatisticsAbortion, SpontaneousPerinatal MortalityCenters for Disease Control and Prevention (U.S.)Risk AssessmentCase-Control StudiesIncidenceAfrican AmericansSecondary PreventionVaginaFetal DevelopmentBetamethasoneUltrasonography, PrenatalTripletsUreaplasma InfectionsMaternal WelfareApgar ScorePregnancy Trimester, FirstInfant, Newborn, DiseasesPlacentaRiskTime FactorsLabor OnsetPreconception Care