Thanks for your input. I guess I will talk to his teacher and go from there. He is getting speech right now in school. I forgot to mention he is potty trained, but sometimes he ask for a diaper to poop. I just want to conversate with him. He repeats a lot of things he hears so maybe it will come soon.
Thanks again
Has he ever been evaluated for his language delay? If not, I would definitely start there, by contacting a speech-language pathologist (the local school district is a great place to start, they provide services as early as age 3). They will definitely want to start with a hearing screening, and then evaluate his speech, language, and social skills.
It could simply be a speech/language issue. If his delay is significant, early intervention is vital for him to catch up to peers by the time he needs to start learning to read and write. He may be avoiding participating in "learning" activities at school because the language is too advanced for his current language abilities, and participating in those activities is a struggle.
If the speech-language pathologist has concerns about autism, she will refer you (or advise you to contact) to a developmental pediatrician, a child psychologist, or a pediatric neurologist. These are the only professionals who can diagnose autism.