ZidovudineMothersInfant, NewbornInfant, PrematureInfant CareInfant, Premature, DiseasesInfant FoodAnti-HIV AgentsInfant BehaviorInfant FormulaDidanosineInfant MortalityInfant, Newborn, DiseasesInfectious Disease Transmission, VerticalSudden Infant DeathPregnancyLamivudineInfant Nutritional Physiological PhenomenaStavudineBreast FeedingHIV InfectionsReverse Transcriptase InhibitorsInfant, Very Low Birth WeightInfant, Low Birth WeightPregnancy Complications, InfectiousZalcitabineNevirapineHIV-1Infant WelfareDideoxynucleotidesDideoxynucleosidesAcquired Immunodeficiency SyndromeChild DevelopmentGestational AgeAIDS-Related ComplexMilk, HumanMother-Child RelationsInfant, Extremely Low Birth WeightDrug Therapy, CombinationHIV Reverse TranscriptaseBottle FeedingBirth WeightInfant, Small for Gestational AgeCD4 Lymphocyte CountInfant, Extremely PrematureIndinavirCryingMaternal-Fetal ExchangeIntensive Care Units, NeonatalHIV Core Protein p24Drug Resistance, ViralViral LoadInfant Nutrition DisordersPrenatal Exposure Delayed EffectsBenzoxazinesDouble-Blind MethodThymine NucleotidesProspective StudiesPrenatal CareRNA, ViralTime FactorsFollow-Up StudiesRespiratory Distress Syndrome, NewbornRisk FactorsPregnancy ComplicationsCohort StudiesBronchopulmonary DysplasiaPerinatal CareBotswanaDevelopmental DisabilitiesAntiviral AgentsAntiretroviral Therapy, Highly ActiveMaternal AgeOrganophosphonatesPregnancy OutcomeDrug InteractionsIntensive Care, NeonatalOxazinesHIV Protease InhibitorsHIVFetal BloodRetrospective StudiesIncubators, InfantAnti-Retroviral AgentsFathersDrug Resistance, Multiple, ViralDiarrhea, InfantileDelivery, ObstetricInfant EquipmentLongitudinal StudiesDrug Resistance, MicrobialHIV SeropositivityTerm BirthTreatment OutcomeNelfinavirPostnatal CareDrug Administration ScheduleEnterocolitis, NecrotizingGrowthAdenine