“…Mothers and fathers reference objects and events in the environment at equivalent rates during parent-child free play (Bornstein, Vibbert, Tal, & O'Donnell, 1992). Mothers and fathers alike produce more explicit than implicit directives (Golinkoff & Ames, 1979), and they do not differ on the mean length of their utterances (Brédart-Compernol, Rondal, & Perée, 1981;Fash & Madison, 1981;Gleason, 1975;Hladik & Edwards, 1984;Masur & Gleason, 1980;Pancsofar & VernonFeagans, 2006;Pratt, Kerig, Cowan, & Cowan, 1992), repetitions, or expansions (Gleason, 1975). Both mothers and fathers use shorter utterances and adjust their speech to their children aged 9 months to 3;0 years (Fash & Madison, 1981;Golinkoff & Ames, 1979;Kavanaugh & Jirkovsky, 1982).…”