Fetal WeightFetal DevelopmentUltrasonography, PrenatalBody WeightBirth WeightPregnancyFetusGestational AgeFetal Growth RetardationPlacentaPregnancy Trimester, ThirdBack PainLow Back PainFetal MacrosomiaWeight GainBiometryEmbryonic and Fetal DevelopmentBackWeight LossLitter SizePregnancy, AnimalOrgan SizeInfant, NewbornMolecular WeightUmbilical ArteriesAnthropometryMaternal-Fetal ExchangeFetal Nutrition DisordersAmniotic FluidFetal MonitoringPregnancy Trimester, SecondFetal ResorptionAbnormalities, Drug-InducedUterusPregnancy OutcomeReproducibility of ResultsPregnancy, TwinPlacental CirculationOligohydramniosAbdomenPredictive Value of TestsFetal ViabilityCrown-Rump LengthParietal BoneBack InjuriesTeratogensPregnancy, ProlongedProspective StudiesSheepPregnancy in DiabeticsPolyhydramniosInfant, Small for Gestational AgeThighParityUltrasonographyReference ValuesPlacental InsufficiencyFetal DeathPregnancy ComplicationsFetal BloodFetal HeartTwinsSensitivity and SpecificityFemurMaternal Nutritional Physiological PhenomenaSwinePregnancy, High-RiskRegression Analysis