Early behavioral specific characteristics of infants under 12 months with a high likelihood of autism spectrum disorder in Japan

Résumé fourni par la source

The early behavioral specific characteristics of children between the ages of 18 and 24 months with a high likelihood of autism spectrum disorder (ASD) have been attributed to a lack of or delay in social behavior; however, children under 12 months are rarely examined. This study aims to clarify the early specific characteristics of the ASD likelihood group by examining the differences between children with ASD high likelihood (ASD-HL), children with ASD moderate likelihood (ASD-ML), and those with ASD no likelihood (ASD-NL), specifically children under the age of 12 months. We assessed children with ASD likelihood using a short version of the Japanese M-CHAT through a two-step screening process at 18 months and 24 months in a Japanese cohort (n = 364). The results showed that the children with ASD likelihood had more specific developmental disabilities in gross motor, fine motor and adaptive, and language at 4 months, except in social communication. The percentage of pass items in gross motor and fine motor skills at 7 months significantly predicted ASD likelihood in children. The study’s findings suggest unique developmental trajectories for children with ASD likelihood. Children with ASD likelihood showed early deficits not in social communication, but in gross motor functions around the age of 6 months. Specific disabilities in social communication increased rapidly by 12 months of age. • We examined early signs of the ASD likelihood group before 1-year-old in Japan. • The ASD likelihood group showed more gross motor problems around 6 months of age. • Difficulties in their social communication increased from 6–7 months to 1-year-old. • Gross motor and social communication showed opposite developmental trajectories.

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