Thrush in babies generally indicates that the child has low immune function, or it has been caused by the long-term use of antibiotics, leading to an imbalance of bacteria and the overgrowth of white Candida in the oral mucosa. Thrush is not scary, and we can generally treat it by using 2.5% sodium bicarbonate to clean the mouth, followed by applying nystatin tablets to the oral cavity three times a day. It usually heals in three to five days. However, thrush tends to recur, so it's important to pay attention to oral hygiene.