If a two-year-old child has a white tongue, it is mainly considered to be caused by the following conditions: a. Normal dyeing of the tongue due to drinking milk. As two-year-old children often also drink milk, if the child drinks milk, the milk remains on the tongue, which will appear white tongue. This situation parents only need to let the child appropriate more warm water, rinse the mouth, the tongue white situation will disappear significantly, which can be distinguished from other causes of the tongue white. Second, caused by cold. If the wind is cold, the tongue will also appear white, and the degree of whiteness is heavier, the tongue is also thicker, and often accompanied by nasal congestion, runny nose, fever and other cold symptoms, this time you can give the child timely warm treatment, appropriate to drink more warm water.