Maternal AgePregnancyPaternal AgeDown SyndromeBirth OrderPregnancy, High-RiskInfant, NewbornAmniocentesisParityPregnancy OutcomeBirth WeightGestational AgePrenatal DiagnosisTrisomyPregnancy Trimester, FirstPregnancy ComplicationsCongenital AbnormalitiesRisk FactorsNondisjunction, GeneticAbortion, SpontaneousBirth CertificatesCrown-Rump LengthNuchal Translucency MeasurementAneuploidyChromosome DisordersCesarean SectionPregnancy Trimester, SecondInfant, Low Birth WeightUltrasonography, PrenatalInfant MortalityPregnancy, MultipleFetal DeathChorionic Gonadotropin, beta Subunit, HumanMothersPremature BirthPregnancy-Associated Plasma Protein-AHernia, UmbilicalGastroschisisPreimplantation DiagnosisCohort StudiesPrenatal CareAge FactorsFertilization in VitroLive BirthStillbirthBirth IntervalsPerinatal MortalityLogistic ModelsReproductive Techniques, AssistedInfant, Small for Gestational AgePregnancy in AdolescenceFetal DiseasesSocioeconomic FactorsAbortion, EugenicBirth RateOdds RatioChromosome AberrationsRetrospective StudiesPolar BodiesDelivery, ObstetricAgingProspective StudiesMarital StatusPrevalenceChromosomes, Human, Pair 21Case-Control StudiesRegistriesTwinsObstetric Labor ComplicationsChorionic Villi SamplingChromosomes, Human, Pair 18Chromosomes, Human, 21-22 and YNeckKaryotypingPrenatal Exposure Delayed EffectsEducational StatusBreast FeedingRegression AnalysisSex RatioMaternal ExposureRiskChromosomes, Human, Pair 13Social ClassObstetric Labor, PrematureNorwayPre-EclampsiaSperm Injections, IntracytoplasmicNasal BoneDiabetes, GestationalEmbryo TransferSmokingDenmarkGravidityCross-Sectional StudiesAbortion, HabitualUnited StatesFetal MacrosomiaSicilyPregnancy Trimester, ThirdMultiple Birth Offspring