Fetal WeightFetal DevelopmentUltrasonography, PrenatalBody WeightBirth WeightPregnancyFetusGestational AgeFetal Growth RetardationPlacentaPregnancy Trimester, ThirdFetal MacrosomiaWeight GainBiometryEmbryonic and Fetal DevelopmentWeight LossLitter SizePregnancy, AnimalOrgan SizeInfant, NewbornMolecular WeightUmbilical ArteriesAnthropometryMaternal-Fetal ExchangeFetal Nutrition DisordersAmniotic FluidFetal MonitoringPregnancy Trimester, SecondFetal ResorptionAbnormalities, Drug-InducedUterusPregnancy OutcomePregnancy, TwinPlacental CirculationOligohydramniosReproducibility of ResultsAbdomenFetal ViabilityCrown-Rump LengthParietal BonePredictive Value of TestsTeratogensPregnancy, ProlongedPregnancy in DiabeticsSheepPolyhydramniosInfant, Small for Gestational AgeProspective StudiesParityThighUltrasonographyReference ValuesPlacental InsufficiencyFetal DeathPregnancy ComplicationsFetal BloodFetal HeartTwinsSensitivity and SpecificityFemurMaternal Nutritional Physiological PhenomenaPregnancy, High-RiskSwineRegression Analysis