Hi there,
iam not an expert by any mean, but after many hours of reading and researching, i found that probiotics are very good to treat yeast infetions. As a matter of fact (this is not the same, but i will just give you an example that we have going on rigth now), my dd has a yeast infection on her bottom from an antibiotic she is on and i have been giving her Floramore, a probitoic by renew life (two capsule s a day) with good results. You can also put the powder on your breast, three times a day w/o hurting yor baby; put a breast pad on (although you might want to check with his ped for an ok).
Also a solution of a drop or two of tea tree oil, mix with a T. of applecider vinegar might work as well. The only problem is tea tree oil is toxic ( in high concentraion of course) , so you might no want to use it while breast feeding or you may wash your breast really well before feeding your baby. Good luck, i hope it clears soon.