Probiotics are absolutely fine in the baby's mouth. I always recc just 
as what was described- swipe the baby's mouth about 4-5 times a day with 
acidophilus powder. Nystatin will almost always cause a diaper rash 
after the first 1-2 days of use. For that rash,  I recommend a topic 
antifungal such as clotrimazole or nystatin ointment. For many babies, 
though, the rash goes away in 4-5 days without any special treatment.
Anne Eglash MD
Clinical Associate Professor
Dept of Family Medicine
University of Wisconsin School of Medicine and Public Health
600 N. 8th St.
Mount Horeb, WI, 53572
608-437-3064 (O)
608-437-4542 (fax)

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