Speech delay at age 4 combined with strong memory and some infantile behaviours

My child is 4 years old he knows and verbalizes every thing in one word. he is learning to make 2 to 3 word sentences. he has excellent memory and acts younger than his age group with some features of Autism but has no repetitive movement or self harm. I can't place him in any disorder my self what do you think? thank you

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