I think since it's speech /articulation related, it's well worth getting him fully checked out. But in case this resonates at all, this is what happened for us at 3.5...
Thanks for your input everyone! I spoke to a friend who is a speech pathologist and she suggested an articulation screening tool and sent me a link for one from a site called Mommy Speech Therapy.
Once I was actually sitting down quietly with DS one on one, he actually did quite well and scored in the range for a normal 4 year old. The sounds he has trouble with are the ones that they are meant to master by 4 or 5.
I think that perhaps it is partly tiredness/laziness on his part and partly because when I am generally talking to him there are two other little people around.
I am going to take a wait and see approach - maybe take note of the words he has trouble with over the next two weeks before I do anything.
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