Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Triggering (language acquisition) ; Subset principle; Parametrization (language acquisition) ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; German