If your baby’s mouth smells bad, consider that the brushing is not clean and the oral hygiene situation is poor. For this case, parents are advised to assist their babies to brush their teeth every day because children’s ability of fine hand movement is not yet perfect, so it is difficult to completely clean the dirt off the teeth, so children under eight years old need parents’ help to brush and clean their teeth. It is best to rinse the baby’s mouth with warm water after drinking milk, and parents can gently wipe the baby’s dental bed and teeth with a soft, moist gauze. Another reason for a baby’s mouth to smell is because the gastrointestinal digestive function of children is not yet perfect, or because they are fed a greasy, indigestible diet, which leads to the accumulation of food in the baby, causing a corrupt, sour taste in the mouth. Children can be given appropriate amounts of stomachic and digestive tablets, Pat Chun Gao, and large hawthorn pills to promote digestion, while children should be fed with a light, easily digestible diet.