hi doctor, my son age is 2 years 2 months but still he is not talking. apart from talking he is active and also when we ask him to bring something he will understand and bring and also he will do his work whatever he wants. he will only say bye,ayyo, abba words. these words also when we ask him to say that time he will not say, when he wants to say based on situation he will say. can you please suggest what is the reason for speech delay.