Yes a stranger might make out a couple of key words but wouldnt completely understand what he would be trying to communicate. He has always shown a annoyance to loud speach and loud music or singing. A friend of mine was remarking that I may want to ask his doctor about autism because of these things. Thank you so much for replying back to me on this question.
Speaking very generally, three issues would be present to consider Autism:
-Delayed communication/language. May have speech but not communicative... may repeat others or label things but doesn't use language to request, protest, comment, answer questions, share ideas, etc.
- Impaired social communication (interaction, shared attention, turn-taking, eye gaze, etc)
- Repetitive behaviors and/or restricted patterns of interest - can involve constant, repetitive behaviors like flapping hands, spinning objects, etc; using toys in non-functional ways like only spinning the wheels of cars or lining things up; fixation on a subject or object (for instance, trains -- learns everything about the history of trains, types of trains, memorizes the local train schedule, only talks about trains); strict adherence to routines or rituals with strong negative response when routine is broken; difficulty handling new situations or transitions
Also common are unusual sensory issues (like being bothered by bright lights, loud sounds, touch, texture etc more than an "average" child) and motor development delays.
If speech is the only issue, I would not be concerned about Autism. However, if he is four years old and a stranger can't easily understand his speech, or his overall language isn't as developed as you'd expect, I would consider having his speech/language evaluated. Language skills are central to success in academics, so if he really is behind it is best to get him in a good intervention program before school age.
In the US, you can talk to your local public school district for assessment and treatment options.
Good luck!