Thrush are passed back and forth from baby's mouth to Mama's breast during nursing sessions (and then back and forth again if both members of the breastfeeding team aren't treated). Thrush may reduce milk supply. It may also be harder to breastfeed while mommy and your baby are experiencing symptoms. However, she can continue to breastfeed during treatment. Continuing to breastfeed can help maintain milk supply. It can take up to two weeks for thrush to dissipate completely. Make sure mommy takes all of her medication and practice good hygiene to avoid having a recurrence. Also toss out any milk expressed and stored while mommy were infected. For your baby, your pediatrician may prescribe an antifungal medication (such as Nystatin), which is applied topically to the insides of the mouth and tongue multiple times a day for 10 days. As you will be feeding your baby more often than you apply the medication, ask your doctor how often and how much to apply. You may find it helpful to use the cream after your baby nurses to sleep, especially if he is likely to sleep for a while. Best to consult your PD.