Bed RestMothersHead-Down TiltWeightlessness SimulationWeightlessness CountermeasuresRestCardiovascular DeconditioningSpace FlightBedsWeightlessnessChild WelfareOrthostatic IntoleranceDisabled ChildrenChild BehaviorLower Body Negative PressurePregnancyMother-Child RelationsInfant, NewbornChild RearingChild Health ServicesTime FactorsChild of Impaired ParentsChild Behavior DisordersBed OccupancyParentsExerciseChild, InstitutionalizedChild PsychologySupine PositionBreast FeedingMuscular AtrophyMuscle, SkeletalPlasma VolumeEarly AmbulationDental Care for ChildrenChild, OrphanedHypotension, OrthostaticChild Nutritional Physiological PhenomenaChild Nutrition DisordersFathersRisk FactorsHypovolemiaChild LanguageSpinal PunctureAmino Acids, EssentialParent-Child RelationsQuestionnairesImmobilizationVascular CapacitanceChild MortalityInfectious Disease Transmission, VerticalAge FactorsProspective StudiesTreatment OutcomeCross-Sectional StudiesMaternal-Fetal Exchange