my son is not able to speak clear. .he cannot say ka, ra kha well instead of it he say.. ta.. he produces saliva a lot. .he is 5 years old

A. the speech is delayed it requires proper assessment in this case For this query it is important that you should consult your nearby doctor or pediatrician to get a proper clinical assessment done so that the doctor may advise you the proper investigations and the treatment which will be required after knowing proper details it is difficult to comment here.