My 2 year is not really talking yet but he makes alot of sounds. He is doing alot of grunting/growling noises & also tries to say words but it sounds like it's with his throat but with his mouth closed. He has good hearing and I can't see any problems with his tounge. Could there be something to do with his throat that is preventing him from making certain sounds? He says, hey, hi, daddy ("dede"), no, but doesn't show alot of jaw movement to say words like "ball". (he is seen for speech but only twice a month)