Do you know much about the subject of autism?
I know some as I had to do research for it before. It is a developmental disorder characterized by problematic social interaction and communication.
I have an autistic brother and it is difficult for him sometimes. I heard the disorder exists on a spectrum though.
Usually there is a restricted repetitive behaviour.
Hm, so would that mean they do the same things over and over again?
I guess there are set cues or things that set them off leading to a repetitive reaction or action. 
I haven't seen him do that, but I suppose all cases are vastly different.
I just researched it so I'm not doctor. Parents usually notice signs in the first two or three years of their child's life
It's a complicated subject so I wouldn't expect you to know everything about it. My step bother started exhibiting symptoms very young himself.
Autism
Autism is a developmental disorder characterized by difficulties with social interaction and communication, and by restricted and repetitive behavior. Parents usually notice signs during the first three years of their child's life. These signs often develop gradually, though some children with autism reach their developmental milestones at a normal pace before worsening.
Autism is associated with a combination of genetic and environmental factors. Risk factors during pregnancy include certain infections, such as rubella, toxins including valproic acid, alcohol, cocaine, pesticides and air pollution, fetal
controversial. A common criticism against autistic activists is that the majority of them are "high-functioning" or have Asperger syndrome and do not represent the views of "low-functioning" autistic people.
Advocacy Pro-cure perspective.
The pro-cure perspective is a view of autism as a disorder characterized by various impairments, mostly in communication and social interaction. Although positive traits such as savant syndrome may be recognized, they are not seen as outweighing the negatives. Pro-cure organizations generally favor the medical model