Clinically there is no such thing as the fastest way to deal with a three-month-old baby with a thick, yellow tongue, which is usually caused by the baby’s accumulation of food and can be dealt with through general care and medication. 1. General care: Parents can give the baby to drink the right amount of warm water to promote the baby’s body metabolism, so as to alleviate the symptoms of thick yellow tongue. Do not give the infant too much food at one time on weekdays, and it is recommended to eat small meals. If the baby is breastfed, the mother should eat a light diet and avoid spicy and stimulating food, so as to alleviate the symptoms indirectly. 2. Medication: If the general treatment does not relieve, you can take probiotics (such as Bacillus subtilis bacillus granules) to regulate the gastrointestinal function, alleviate the accumulation of food, and improve the situation of yellow tongue coating. When a three-month-old baby has a thick yellow tongue, it is recommended that parents take him or her to the hospital in a timely manner and follow the doctor’s instructions for treatment.