Play and PlaythingsChild WelfareDisabled ChildrenChild BehaviorChild Health ServicesChild RearingChild, InstitutionalizedChild Behavior DisordersChild PsychologyChild of Impaired ParentsDental Care for ChildrenChild, OrphanedParentsChild LanguageChild Nutrition DisordersChild Nutritional Physiological PhenomenaChild MortalityMothersAge FactorsParent-Child RelationsCross-Sectional StudiesPrevalenceRisk FactorsQuestionnairesProspective StudiesChild CustodyFollow-Up StudiesInfant, NewbornRetrospective StudiesChild Development Disorders, PervasiveTime FactorsPediatricsBody HeightAsthmaUnited StatesSchoolsSocioeconomic FactorsTreatment OutcomeLongitudinal StudiesMother-Child RelationsPregnancyChild, AbandonedCase-Control StudiesHospitals, PediatricAutistic DisorderGrowth DisordersChild Nutrition SciencesIntelligenceLanguage Development DisordersFamilySex FactorsDiarrheaRural PopulationLanguage DevelopmentIncidenceSeverity of Illness IndexFamily CharacteristicsAttention Deficit Disorder with Hyperactivity