Birth RateLive BirthPregnancyBirth WeightPremature BirthPregnancy in AdolescencePregnancy RatePregnancy OutcomeEmbryo TransferFertilization in VitroIllegitimacyInfant, Low Birth WeightInfant, NewbornMultiple Birth OffspringReproductive Techniques, AssistedMaternal AgePregnancy, MultipleBirth CertificatesOvulation InductionOocyte RetrievalCell MovementSperm Injections, IntracytoplasmicVital StatisticsEmbryo ImplantationInfertility, FemaleAnimal MigrationInfertilityCryopreservationReproductive Control AgentsCell Migration InhibitionFollicle Stimulating Hormone, HumanAbortion, SpontaneousForeign-Body MigrationGamete Intrafallopian TransferGestational AgeSingle Embryo TransferClomipheneBirth OrderCesarean SectionInfant MortalityFertility Agents, FemaleAbortion, HabitualAbortion, LegalPregnancy ComplicationsInsemination, Artificial, HomologousFertilityEmbryo Culture TechniquesDelivery, ObstetricNational Center for Health Statistics (U.S.)United StatesSingle ParentPaternal AgePrenatal CareCleavage Stage, OvumTwinsNafarelinRetrospective StudiesSex RatioFetal MortalityMinorsCell AdhesionParental NotificationCohort StudiesCell Migration AssaysAbortion, InducedFetal DeathOocyte DonationCells, CulturedMacrophage Migration-Inhibitory FactorsMenotropinsMarital StatusBlastocystTime FactorsBirth IntervalsInsemination, ArtificialDemographyParturitionChemotaxisSignal TransductionStillbirthAnovulationPreimplantation DiagnosisParityObstetric Labor, PrematureFamily Planning PolicySperm RetrievalFallopian Tube DiseasesImmunity, HerdHispanic AmericansHuman MigrationLabor, InducedBirth InjuriesCell ProliferationTransendothelial and Transepithelial MigrationEmigration and ImmigrationSeasonsReproductive TechniquesRisk FactorsChemotaxis, LeukocyteAge Factors