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.
Please feel free to contact me should you require any further information or if you need a referral to a professional in you area (firstname.lastname@example.org)
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