This study found a link between screen time and autism by looking at TV exposure among very young children, nevermind phones and tablets.
https://www.earth.com/news/toddler-screen-time-linked-to-atypical-sensory-behaviors/
It makes sense in a way. How we process the world might be a bit messed up with we were exposed to lots of bright shapes and loud sounds doing impossible things before our senses were fully developed.