The tongue of a normal two-year-old baby should be thin and red. If the tongue is a little white, it usually indicates reduced digestive function, which may be caused by cold in the gastrointestinal tract or by intestinal viral or bacterial infection. You should also pay attention to whether there is a weak spleen and stomach function caused by poor digestion, some babies may also be affected by disease factors, such as intestinal micro-ecosystem imbalance and poor digestion. Some babies may also be lactose intolerant or have food allergies, which can lead to poor digestion and a thick white tongue. There are also other systemic diseases that may affect the digestive system, such as pneumonia, intracranial infections, sepsis, etc., which may result in poor digestion and a thick white tongue.