I had chronic monthly recurring vaginal thrush for about 7 years and nothing helped getting rid of it permanently so I resigned my self to just living with it when I read about bicarb of soda and took half a teaspoon in a glass of water once or twice a day for 10 days and it has been gone ever since! I couldn't quite believe it at first but that was 2 years ago now so the result is solid!
Baking soda quickly took care of a case of thrush my less-than-a-year-old son had. All it took was about one teaspoon of baking soda mixed in a small cup of water, swabbed inside baby's mouth 4 or 5 times a day with a Q-tip that i dipped into the mixture. It vanished in about 48 or fewer hours. It's been many years ago, but I think this is the amount of baking soda relative to water. I definitely remember that it worked very fast. This seems to be a simpler method than any of the others here.
The pediatrician (I've since learned to avoid such unnecessary licensed quacks :)) had recommended "a new drug" being used at the teaching hospital where she worked.
----Please be aware that teaching hospitals are notorious for using patients as guinea pigs: read the book, "Confessions of a Medical Heretic," to find out this and many other fascinating/horrifying facts about doctors. The physician who wrote it says to avoid doctors as much as you can!---- I called the local La Leche (breastfeeding support organization) to see if they knew something less toxic, and that is where the baking soda and water remedy came from.