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The other thing I would suggest is that you keep track of whether his blood sugar is low or high when you notice the struggling for speech. When a person is hypoglycemic, one of the symptoms can be finding it difficult to command one's vocabulary and if the hypoglycemia is severe enough, troubles enunciating words is a common symptom. That is why you read that a diabetic person sometimes sounds drunk when low -- the speech thickens and the person talks slower because the brain is not functioning at its best to send the words and control the muscles. So do check to make sure that he isn't low or high (some people, myself included, seem to have similar symptoms to hypoglcyemia if glucose levels go too high -- the reason is that when glucose is high, the brain is not able to use the glucose in the blood because of insufficient insulin, and the result is the same brain function problem that happens when the brain is starved for glucose because the person is hypoglycemic). If you notice a pattern of low or high glucose when you notice the speech problems, then you can easily fix the situation yourself. And if hypoglycemia or hyperglycemia are part of the problem, once the glucose levels are normalized, the problem should go away.
It is not that uncommon for little boys to have more problems with speech than little girls, by the way. My own son did not stutter, but did have some speech clarity problems that were noticed when he started kindergarten, and some speech exercises fixed the problem very quickly. We wish you the best.