My ds had it for MONTHS... literally, from month 2 until just very very recently. Like a few weeks ago. We did 3 rounds of gentian violet, many many rounds of nystatin, probiotics..... I finally saw another doc who told me it would eventually run its course and die off. And it finally did. I left it untreated for about 9 weeks and it is now gone. Its unusual for a baby over 6 months old to still have it, but my baby is 10.5 months and had up until 2 weeks ago.