i have a nephew that is 3 months old and he has had thrush pretty much continuously since he was 1 week old. he was solely breastfed until he was 6 weeks and now he is fed breast milk via bottle. his mother sterilizes each bottle after use and also sterilizes his binkys. they contacted the doctor and she keeps giving him scripts for nystatin. does anyone know what could be the cause of this? thank you for any help you can offer.