Pregnancy ComplicationsWeight GainPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsBody WeightPregnancy Trimester, FirstFetal Growth RetardationPregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticBirth WeightAbruptio PlacentaePremature BirthPregnancy, AnimalPlacentaInfant, NewbornPregnancy Trimester, SecondPregnancy Trimester, ThirdUterine ArteryGestational AgePostoperative ComplicationsCivil DisordersPlacenta DiseasesPregnancy Complications, InfectiousDiabetes, GestationalObstetric Labor, PrematureEclampsiaPregnancy, TwinWeight LossFetal DeathPlacental CirculationPreconception CareCongenital AbnormalitiesTrophoblastsCesarean SectionPrenatal CareObstetric Labor ComplicationsPregnancy, High-RiskRisk FactorsPregnancy, MultipleInfant, Small for Gestational AgeUterusParityStillbirthUltrasonography, PrenatalAbortion, HabitualMaternal AgeInfant, Low Birth WeightPregnancy ProteinsPregnancy TrimestersProspective StudiesRetrospective StudiesPregnancy RateAntibodies, AntiphospholipidPlacental InsufficiencyMaternal-Fetal ExchangePlacentationFetal DevelopmentObesityDelivery, ObstetricCohort StudiesMultiple Birth OffspringPregnancy TestsPregnancy in DiabeticsMaternal WelfarePregnancy, TubalPregnancy in AdolescenceAntiphospholipid SyndromeMolecular WeightReproductive Techniques, AssistedFetal Membranes, Premature RuptureOdds RatioTreatment OutcomeFertilization in VitroTime FactorsBody Mass IndexLogistic ModelsDeciduaInfant, PrematureRisk AssessmentEatingThrombophiliaUnited StatesPregnancy, UnplannedFollow-Up StudiesIncidenceQuestionnairesPregnancy, UnwantedDietEnergy IntakeNorwayIntraoperative ComplicationsFetal WeightHomocysteineOrgan Size