Researchers aimed at ascertaining the extent to which the duration of screen time in infancy is linked with the development of autism spectrum disorder at 3 years of age.

• Data of a total of 84,030 mother-child dyads derived from a large birth cohort in Japan were analyzed.

• Findings suggest a significant correlation of longer screen time at 1 year of age with autism spectrum disorder diagnosis at 3 years of age among boys, but not girls.

• Researchers recommend providing guidance on appropriate screen time in infancy.