Thick yellow tongue coating in infants is related to accumulation of food. When a baby is fed improperly, resulting in impaired spleen and stomach function, food will slowly accumulate and yellow tongue coating will appear, and the child will also have no appetite, bloating, vomiting and other manifestations. Yellow tongue is also very related to gastrointestinal problems, indigestion, weak spleen and stomach, or the body’s fire and other conditions may appear yellow tongue. Therefore, parents should observe whether the baby has the above symptoms, and pay attention to the care, the diet should be small and frequent meals, appropriate water, if necessary, can take some drugs to help digestion to improve. If the child does not have any accompanying symptoms, it may also be due to poor oral hygiene, milk dirt accumulates on the tongue resulting in yellow tongue coating, so parents should also pay attention to the baby’s oral care. If the thick yellow tongue coating is serious, go to the hospital in time.