My mistake, thanks Kirsty for the clarification.
The rest stands, however. Generally 4-6% is considered the normal range for people without
diabetes; diabetics can be within 1% of this range (higher) and be considered well controlled.
Every lab has slightly different "normal" ranges, however, depending upon the method used to calculate.
At home kits can be more prone to inaccurate readings because of "operator error".
Diabetes cannot be diagnosed on A1c readings, again generally two fasting glucose levels are required for formal diagnosis.
The increased thirst and urination can be symptoms of
diabetes, but all the symptoms you list are common in young children and really don't mean much without the fasting glucose levels to confirm.
As far as diet goes, obviously completely eliminate any type of refined sugar (sweets, soda) and "bad" carbs like any type of white bread, pasta, white rice, potatoes, and cereals with sugar. Learn to read labels carefully. Sugar, including corn syrup, is an ingredient in almost everything you can buy; look for sugar free versions, but still be aware of corn syrup. You can find many, many sugar free and whole wheat versions at Whole Foods, or any health food store.
The "good" carbs are whole wheat (not just wheat) bread, brown rice, whole grain cereals. Homemade oats, even quick oats, not the box flavored variety is the best choice of all, the most nutritious and the most fiber with protein and has no sugar. You can use Splenda to sweeten anything.
Limit fruit juices as they are mostly fructose which is a sugar, so small quantities are plenty. Include plenty of leafy greens and vegetables.
Lean meats broiled, baked or grilled are recommended, not fried.
Dairy is important, of course, but buy the fat free versions.
Basically a diabetic diet is recommended for everyone, not just diabetics. Be sure to limit portions, too much of this diet is also not good. Ask your doctor for a referral to a nutritionist or look on the web for correct portions for adults and children. You will lose weight on this "diet"; it is not a fad diet and is for life.
I hope this helps. :D
Shannon