Yes! Under your doctor's supervision for a medical problem needing the drug!
Depends. This is a wonderful drug that has uses in kids or adults at any age. When used for appropriate conditions at proper doses it is safe & effective. In therapeutic doses it can suppress the immune system, so their are limitations to its use. I wouldn't just give it to a kid on your own, but if prescribed by its doc, no problem.
If prescribed. It's a safe medication if your child's doctor prescribed it. If you want more information, please provide more details.
Yes. I use it routinely in my practice in this age group.