Maternal AgeGestational AgeBirth WeightInfant, Small for Gestational AgePregnancyInfant, NewbornPremature BirthInfant, Low Birth WeightInfant, PrematurePregnancy OutcomeBirth OrderUltrasonography, PrenatalDown SyndromePregnancy ComplicationsBirth CertificatesPaternal AgePregnancy, High-RiskParityBirth RatePregnancy Trimester, FirstPregnancy Trimester, SecondAmniocentesisCrown-Rump LengthInfant MortalityCongenital AbnormalitiesPrenatal DiagnosisFetal Growth RetardationInfant, Premature, DiseasesFetal DeathObstetric Labor, PrematureRisk FactorsPregnancy Trimester, ThirdFetal DevelopmentFetusCesarean SectionDelivery, ObstetricFetal DiseasesStillbirthCohort StudiesAbortion, SpontaneousPrenatal CarePregnancy, MultipleApgar ScoreMothersProspective StudiesInfant, Very Low Birth WeightTwinsIntensive Care Units, NeonatalBirth IntervalsTrisomyPre-EclampsiaRetrospective StudiesTerm BirthAmniotic FluidChild DevelopmentPerinatal MortalityMaternal ExposurePrenatal Exposure Delayed EffectsNuchal Translucency MeasurementFetal MacrosomiaMultiple Birth OffspringPlacentaChromosome DisordersLogistic ModelsNondisjunction, GeneticAneuploidyGastroschisisBody HeightFetal HeartObstetric Labor ComplicationsChorionic Gonadotropin, beta Subunit, HumanCase-Control StudiesRetinopathy of PrematurityTripletsRegression AnalysisPerinatal CareFetal BloodFetal MortalityLive BirthRespiratory Distress Syndrome, NewbornPregnancy, TwinPregnancy-Associated Plasma Protein-AReference ValuesFetal Membranes, Premature RuptureHernia, UmbilicalRegistriesEmbryonic and Fetal DevelopmentOdds RatioFetal WeightHypertension, Pregnancy-InducedDevelopmental DisabilitiesDiabetes, GestationalBronchopulmonary DysplasiaInfant, Newborn, DiseasesBreast FeedingLabor, ObstetricIntensive Care, NeonatalFertilization in VitroUmbilical ArteriesSocioeconomic Factors