To help prevent vaginal yeast infections, you can try the following suggestions:
Keep the external genital area clean and dry.
Avoid irritating soaps (including bubble bath), vaginal sprays and douches.
Change tampons and sanitary napkins frequently.
Wear loose cotton (rather than nylon) underwear that doesn't trap moisture.
After swimming, change quickly into your dry clothing instead of sitting in your wet bathing suit for prolonged periods.
Take antibiotics only when prescribed by your doctor, and never take them for longer than your doctor directs.
If you are diabetic, try to keep tight control over your blood sugar levels.