Hello, I can understand your concern. If your child can hear well and obeys what you say, then he is only having speech problems. It might be a problem related to the muscles related to tongue that may not allow free movements of tongue necessary for pronunciation of words. I would advise you to visit a dentist for examination of his tongue and to check if his tongue movements are fine. If tongue is the problem, then oral surgeon can help with the problem. If tongue is fine, then speech therapist can help. You and other family members should take care not to use signs to explain him thins and not to accept his signals in place of words. Work with him to speak little words aloud and slowly. However, if your son has problems with hearing too, then his tongue may be fine and he is not talking because he does not know what to speak in absence of hearing ability. In that case, ENT specialist should be consulted for problems related to ear. I hope this information guides you well. Thank you for choosing HCM. I wish your son can communicate soon with speech. Best, Dr. Viraj Shah