"How a bigger-looking butt could be a sneaky sign of autism and ADHD" - New York Post

They found some papers where children with autism or ADHD often were found walking a way that causes an "anterior pelvic tilt", which makes your butt stick out more. I myself personally happen to have such a tilt while being autistic and yeah, my butt sticks out more.

Fun fact: in Dutch ASD is "autismespectrumstoornis" aka "ASS"