has this child had ears checked and other things looked over? maybe it is possible of a little delay that will set him back from others "normal" talking. I have a little girl who is almost 3 years old and is still in a diaper, not much end in sight... and does not talk much at all, she is adopted (not sure on birth situation) but parents have been informed she will be expected to have a 6 month delay in all areas of learning. She too speaks very nasally if at all. everything sounds mumbled and "nosey" when she attempts to speak.