Fetal ResearchFetal Growth RetardationPregnancyPlacental InsufficiencyFetal DevelopmentPlacentaFetal WeightPre-EclampsiaGestational AgePlacental CirculationInfant, Small for Gestational AgeUltrasonography, PrenatalUmbilical ArteriesBirth WeightPlacenta DiseasesInfant, NewbornPregnancy OutcomeFetusPregnancy Trimester, SecondUterine ArteryUterusPregnancy Trimester, ThirdFetal MonitoringPregnancy ComplicationsFetal DeathPlacentationUltrasonography, DopplerTrophoblastsMaternal-Fetal ExchangeAmino Acid Transport System APremature BirthFetal MovementHypertension, Pregnancy-InducedStillbirthInfant, Low Birth WeightPregnancy Complications, HematologicPerinatal MortalityCampylobacter rectusPulsatile FlowAbruptio PlacentaeResearchCardiotocographyPregnancy Trimester, FirstEmbryonic and Fetal DevelopmentPrenatal Exposure Delayed EffectsCaloric RestrictionMaternal ExposureUltrasonography, Doppler, ColorMaternal AgeDNA Restriction EnzymesOrgan SizeInsulin-Like Growth Factor IIArteriesFetal BloodCase-Control StudiesBlood Flow VelocityDelivery, ObstetricSheepPolymorphism, Restriction Fragment LengthProspective StudiesMaternal Nutritional Physiological PhenomenaMothersThrombophiliaPregnancy-Associated Plasma Protein-ARisk Factors