“…No gender differences were found in any of the two subscales, supporting the findings of other studies that suggest that boys catch up to girls' language abilities in preschool years (Altinkaynak, 2019;Fung et al, 2019;Jin et al, 2020;van der Wilt et al, 2020). Significant effects were found for maternal education in both subscales, a result which is also congruent with the findings of previous research in early development (Umek et al, 2006;Weigel et al, 2006;Fenson et al, 2007;Richels et al, 2013;Andonova, 2015;Gonzalez et al, 2017;Cadime et al, 2018;Farley and Piasta, 2020). Regarding birth order, a significant effect was found in vocabulary, indicating that the advantage in lexical abilities of first born children which has been found in toddlers (Fenson et al, 1994;Hoff-Ginsberg, 1998;Berglund et al, 2005;Zambrana et al, 2012) is maintained at least until the fourth year of age.…”