Case study (language acquisition) ; Phonemik (Spracherwerb) ; Phonetics (language acquisition) ; Kindersprache (phonet./phonem.) ; Child language (phonet./phonem.) ; Spracherwerb (phonet./phonem.) ; Language acquisition (phonet./phonem.) ; Phonological development ; Pathologischer Spracherwerb (phon.) ; Phonological development (pathol.) ; Language intervention; Children (speech therapy with) ; Speech therapy for children ; Consonant system ; Correspondence theory; Sympathy theory; Cophonology; Harmonic grammar; Maxent grammar; Optimality theory ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English