Daily Early-Life Exposures to Diet Soda and Aspartame Are Associated with Autism (mdpi.com)

And to be precise it is not the aspartame itself but its metabolisation into methanol, which is known to have toxic byproducts to the neurological development of a fetus. So what is surprising here isn't the effect itself (the wrong vaccines studies supposedly show a novel effect in comparison), but the fact that aspartame is the one of the biggest sources of methanol.