It is common for infants, especially those who are breastfed, to develop thrush. This is characterized by whitish patches in the mouth that do not disappear when wiped. Thrush is caused by a small fungus. The most effective solution is an oral suspension of nystatin, which can be prescribed by a doctor. It is important to treat thrush in both the baby's mouth and on the mother's nipples to prevent the fungus from spreading back and forth. It is also recommended to disinfect items that come into contact with the baby's mouth, such as pacifiers and bottles, as they can also be infected. There are home remedies suggested online, like Canesten cream or gentian violet, but these may not be as effective and could delay access to a more potent treatment. It is best to consult a doctor with your baby to address the issue promptly.