Dear Mital, I would suggest going to see a Speech Therapist for you son. Hope this helps.

Hi mommy
Each baby achieves their mile stone differently.
Babies are good observers, try talking or mimicking like how your baby does. Sing a loud with your baby. Try to acknowledge when they try to speak. This could help babies to talk most of the time.

Thank u

Read this collection too: https://www.babychakra.com/learn/speech-languages

https://www.babychakra.com/learn/1127-learn-about-your-child-s-speech-development-milestones-excerpts-from-a-live-chat-with-speech-therapist-merzia-part-ii