My son is three and he is very smart. I can ask him to do anything and he knows exactly what I' asking him to do. The only problem is that he doesn't speak! He would rather cry or scream for what he wants rather than trying to talk or use words to get something or even communicate. The only words he says is dad, mom and JEEP (YES he's a jeep lover!) His hearing is excellent. Does anyone else have issues with their son not talking?? HELP!!