Bed RestMothersHead-Down TiltWeightlessness SimulationWeightlessness CountermeasuresRestCardiovascular DeconditioningBedsSpace FlightWeightlessnessPregnancyMother-Child RelationsInfant, NewbornOrthostatic IntoleranceLower Body Negative PressureBreast FeedingMaternal-Fetal ExchangeInfectious Disease Transmission, VerticalFathersBed OccupancyTime FactorsSupine PositionMuscular AtrophySurrogate MothersExerciseMuscle, SkeletalPlasma VolumeEarly AmbulationPregnancy ComplicationsInfant CareHypotension, OrthostaticPrenatal Exposure Delayed EffectsPregnancy Complications, InfectiousHypovolemiaPostnatal CareMaternal AgeSingle ParentVascular CapacitanceAmino Acids, EssentialBirth WeightImmobilization