Child Development Disorders, PervasiveAutistic DisorderAsperger SyndromeFetal Alcohol Spectrum DisordersSocial BehaviorLanguage Development DisordersStereotypic Movement DisorderRegression (Psychology)Stereotyped BehaviorCommunication DisordersDevelopmental DisabilitiesTheory of MindChild BehaviorHealth Planning CouncilsIntelligenceIntellectual DisabilityAttention Deficit Disorder with HyperactivityEarly Intervention (Education)SiblingsEndophenotypesPlay and PlaythingsBrainSocial Behavior DisordersLanguage TestsIntelligence TestsCase-Control StudiesVerbal BehaviorNeuropsychological TestsParentsMental DisordersSocial PerceptionLanguage DisordersLanguage DevelopmentInterpersonal RelationsMagnetic Resonance ImagingBipolar DisorderChild Behavior DisordersPsychiatric Status Rating ScalesDiagnostic and Statistical Manual of Mental DisordersNonverbal CommunicationChild DevelopmentFaceGenetic Predisposition to DiseaseDisabled ChildrenChild LanguageFacial ExpressionAttentionImitative BehaviorAnxiety DisordersInfant BehaviorMacrocephalyCompulsive BehaviorFragile X SyndromePersonality AssessmentDNA Copy Number VariationsPsychological TestsWechsler ScalesBrain MappingLanguage TherapyCommunicationSeverity of Illness IndexAge FactorsChild PsychiatryIrritable MoodNeural PathwaysCognition DisordersCognitionMothersPhenotypeLanguageSpeech DisordersRett SyndromeAnalysis of VarianceSpeech TherapyEducation, SpecialBehavior TherapyQuestionnairesCell Adhesion Molecules, NeuronalGroomingEarly DiagnosisPregnancyMood DisordersComorbidityMethyl-CpG-Binding Protein 2Eye Movement MeasurementsSensation DisordersChild WelfareSpeechEmotionsSchizophreniaPsychometricsPsychotropic DrugsPrenatal Exposure Delayed EffectsSibling RelationsAttention Deficit and Disruptive Behavior DisordersPersonal Construct TheoryPrevalenceObsessive-Compulsive DisorderGenetic Association StudiesRisk Factors