“…Differences in temperament and social-emotional behaviors are apparent in children with ASD at a very early age (see reviews by Mallise et al, 2020 ; Chetcuti et al, 2021 ) and can contribute to impairments in adaptive/functional skills ( Chiang and Gau, 2016 ), long-term prognosis and treatment response ( Horner et al, 1992 ; Vivanti et al, 2014 ), as well as increase vulnerability to mental health problems ( Gadow et al, 2004 ; Eisenhower et al, 2005 ; Kagan and Fox, 2006 ; Leyfer et al, 2006 ; Nigg, 2006 ; Rothbart and Bates, 2006 ; Hartley et al, 2008 ; Joshi et al, 2010 ). Although specific temperament profiles have been associated with specific diagnoses (e.g., ADHD, Miller et al, 2019 ; or social anxiety disorder, Chronis-Tuscano et al, 2009 ), a profile for children who are or will be diagnosed with ASD has yet to be identified.…”