Most of a child's articulation should be correct around the age of four and can then continue to improve. If you have concerns, then take him for a full speech and language evaluation to a Speech Language Pathologist and rather be safe. I think it is important to have this taken care of rather sooner than later.
You mention a mild hearing loss in the past, during problems with his middle ears. It is very important to keep on monitoring his hearing as well as middle ear functioning on a regular basis. If you have not had this done in the recent past, i would recommend that you see an Audiologist for a full hearing evaluation as well as an evaluation of the functioning of the middle ears. Unfortunately children loose a period of accurate hearing when they have frequent ear infections or fluid build up. It is often during this period that they develop possible language and speech delays.
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