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I am sorry to hear you are worried about Coco. My name is Rebecca. I am a veterinarian and will do my best to help.
If Coco had an infection, I would expect to see things like sneezing, watery eyes, fever, and perhaps eating less and hiding more, less active. This raspy meow could possibly be the first sign of a respiratory infection. How long since you got the kitten? If the kitten was carrying an infection, it might be a week after being exposed that Coco might start to show other symptoms.
If he is eating well, playing normally, and not sneezing or coughing he probably does not have a serious infection at this time.
Let me know how he is doing and what other questions I can answer.
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