PPVT; Echelle de vocabulaire en images Peabody; EVIP; Test de Vocabulario en Imagenes Peabody; TVIP ; Gesture communication ; Baby talk; Motherese; Child-directed speech; Ammensprache; Babysprache; Infant-directed speech; Fatherese; Language spoken to children ; Spracherwerb (lex.) ; Language acquisition (lex.) ; Vocabulary (language acquisition) ; English