How to Help a 29-Month-Old Who Won’t Speak?

The child can only say simple words like ‘Dad’, ‘Dou Dou’, ‘Dandan’, and occasionally ‘Mom’. He understands what adults say and expresses his meaning through finger pointing or body movements. He has been checked for trace elements at a local hospital and found to be deficient in calcium, so he has been taking calcium supplements but no other checks have been done. We want to know what checks should be done to find out why the child cannot speak, and how we can help him start speaking.
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