You can not tell without formal medical assessment.
This usually is a combination of the pediatrician and a psychologist who is trained in autism, or child psychiatrist.
There are many possibilities here.
So far, you have not specifically sated any abnormality.
Potty training can easily take till 3 in some boys.
The speech can be a simple speech delay.
Hearing problems and visual problems need to be ruled out.
And...more. All dependent on exam and assessment.
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