2mth baby has oral and anal mycoses, I feel itching and redness under nipples bcoz im breastfeeding, can I continue nursing her or I should stop?

Continue but treat. I assume you are talking about thrush and diaper rash. You should be treating these as per your doctor. Your nipples should also be treated, but assuming you've discussed treatment options and proper cleaning with your doctor, you should continue breast feeding unless the pain is prohibitive.