The diagnostic characteristics of autism spectrum disorder (ASD) includes challenges in social communication skills. Among different components of social communication, language, particularly vocabulary, must be supported early in children's development as language is shown to be associated with academic, social, cognitive, and adaptive skills and…

Siblings play crucial roles in each other's cognitive and language development because they observe, imitate, and receive guidance and support from each other during their interactions. In this research, we examined trilingual siblings (ages 6 and 9) from an immigrant family with a rarely explored cultural background (American-born children of…

Investigated birth-order differences in children's early vocabulary development. Compared the composition and age of acquisition of the first 50 and 100 words of 9 firstborns and their younger siblings, using a longitudinal maternal diary methodology. A small but significant birth-order effect was found for the age at which the 50-word milestone…