Thrush is caused by Candida albicans infection of the oral mucosa, and is mostly triggered by unhygienic teats or nipples during feeding, while other triggers include poor oral hygiene, malnutrition, and long-term application of hormones or antibiotics. Unhygienic pacifiers or nipples containing Candida can lead to thrush when the child is breastfeeding. Thrush can also be triggered if the baby eats food containing Candida or comes into contact with clothing or toys with Candida. Thrush can also be triggered by malnutrition or when hormones or antibiotics are applied for a long period of time and the baby’s immune function is reduced, resulting in dysbiosis. Usually parents can use saline and cotton swabs to give the baby oral care, pay attention not to damage the oral mucosa, to reduce bacterial growth, the baby’s personal toys, bottles regularly sterilized, breastfed babies, the mother needs to pay attention to nipple hygiene. When a child develops thrush, he or she should go to the pediatrician in a timely manner to actively seek out the causative factors and take targeted treatment. It should be noted that thrush is easy to repeat, parents must adhere to a sufficient course of treatment.