hello doctor, my younger son is 3yrs 8 m, but still he's unable to speak....there's a delay in his speech. All other activities are normal except speech

A. If you’re sure that it is a speech delay then you should consult a speech therapist they’ll tell you what all the would be required to be given and also some exercise exercises they will advise you which is going to help in betterment of the speech of your child over the period