Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Pathologischer Spracherwerb (phon.) ; Phonological development (pathol.) ; Akzent; Suprasegmental phonology; Prosodie; Prosodics ; German