Purely breastfeeding babies with yellow tongue coating may be caused by poor oral hygiene or weak gastrointestinal function, which may pay attention to oral cleansing, oral medication, dietary adjustments and so on. 1. Physiological reasons: pure breastfeeding baby if long-term not clean mouth, may lead to the accumulation of milk in the tongue moss, the phenomenon of yellowing. If the child does not have other discomforts, generally does not affect the growth and development, do not need special treatment, regular cleaning of the child’s mouth can be. 2. weak gastrointestinal function: pure breastfeeding baby is usually small months of age, gastrointestinal function is weak, easy to affect the digestion, caused by the phenomenon of yellow tongue. You can take probiotics (bacillus subtilis bifidus), waking up the spleen and nourishing children’s granules and other drugs under the guidance of the doctor. In your daily life, you should eat small meals and avoid overfeeding. If your baby’s tongue is yellow, there may be other reasons, so we suggest that you go to the hospital in time to have a thorough examination to determine the cause of your baby’s yellow tongue, and then give targeted treatment or therapy. All of the above medications should be used under the guidance of a doctor.