Thrush in newborns may be related to maternal factors, the newborn’s own factors, hygiene habits, drug factors and other reasons. 1. Maternal factors: Infants are infected by contact with maternal secretions through the birth canal during labor and delivery. If the mother-to-be had Candida albicans vaginitis before pregnancy and it was not treated in time, the newborn may develop thrush. 2. Newborns own factors: high-risk newborns such as preterm babies or low-birth-weight babies with poor oral self-cleaning ability, weak body resistance or salivary glands are underdeveloped, the mucous membrane of the oral cavity is thin and dry, rich in blood vessels, low immunity, if you do not clean your mouth in time after breastfeeding, in the presence of milk in the oral environment of the Candida lurking easy to reproduce, and thus easy to get infected. 3. Hygienic habits: when breastfeeding, bottles, nipples are not sterilized thoroughly or the mother’s breast is not clean, causing contact infection, as well as contact with the presence of Candida infected food, clothing or toys can cause infection. 4. Drug factors: the use of antibiotics in the mouth, resulting in dysbiosis, inhibiting the growth of gram-negative bacteria and bacteria that can synthesize vitamin B may also lead to thrush in newborns. If the symptoms of thrush in newborns are severe or have not improved, they should go to the hospital for treatment.