Körpersprache; Chronemics; Kinetik; Kinesics; Nonverbal communication ; Emotive communication; Expressive use of language ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Kindersprache (Sprachgedächtnis) ; Children's verbal memory; Verbal memory in children ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Morbus Down; Mongolismus; Trisomie 21; Down's syndrome