There are many reasons for a white layer on the tongue of a two-month-old baby, such as physiological phenomena, thrush, indigestion and so on. 1. physiological phenomenon: two months baby tongue on the white layer may belong to the physiological phenomenon, such as milk dirt, due to milk stains remain on the tongue, so there will be a white layer. 2. thrush: thrush belongs to the oral candidiasis, can cause the formation of white spots in the mouth, can be attached to the tongue moss, which leads to the two-month-old baby’s tongue has a white layer. 3. indigestion: baby intestinal micro-ecological environment disorders, eating too much, etc., may lead to gastrointestinal indigestion, so there will be a two-month-old baby tongue with a white layer, accompanied by the phenomenon of bad breath. Two months of the baby’s tongue has a white layer may have other reasons, after the symptoms are recommended to go to the hospital in a timely manner, in accordance with the doctor’s instructions for standardized treatment, not to private treatment, so as not to lead to adverse consequences.