Learning disability ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Baby talk; Motherese; Child-directed speech; Ammensprache; Babysprache; Infant-directed speech; Fatherese; Language spoken to children ; Geräusch (Sprachverständnis) ; Noise (language comprehension) ; Net Auditory Distance; Speech intelligibility (phonet.) ; English