Hi TonyaR,
You're right, I'm no doc, but I do know that an A1c of 5.4 is normal, so I wouldn't worry. You say he's always been a thirsty kid, so that's normal for him-- if his thirst suddenly spiked, that would be different. But of course keep an eye on it, hopefully without pricking him too much for no reason. If he starts losing weight, that's an issue.