My son is four at the end of the month; he is potty trained, can feed himself, dress himself, tidy his toys and can do everything that is asked of him. The nursary has said he is very bright But he doesn't talk. He baby talks and none of it understandable except his sister's name and Mum/Dad. We had his hearing tested today and it's perfect so the expects are not sure why he isn't talking. Is anyone else's child like this?