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McFayden, Tyler C.; Fok, Megan; Ollendick, Thomas H. – Journal of Autism and Developmental Disorders, 2022
The current study investigated the impact of birth order on vocabulary and social language development in 1338 first-born and 1049 s-born autistic youth (M age = 9.03 years, SD = 3.57; 86.4% male) from the Simons Simplex Collection. Frequentist and Bayesian analyses revealed mixed findings in language development. There were no differences in…
Descriptors: Birth Order, Language Acquisition, Autism, Pervasive Developmental Disorders