My 5 month old baby doesn’t reach his development milestones?

My 5 month old baby doesn’t reach His milestones, he seem to have pour eye contact, he haș social smile and laughs but occasionally. I am suspecting him of autism or mental retardation. My question may surprise you: Could he be mentally retarded although he shows signs of intelligence like when I ask him where are the butterflies in His room he turns to look at them? And he does that since he was 4 months old and with some other objects too.

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