The yellowing of the baby’s tongue may be caused by physiological or pathological factors. Physiological factors, such as consumption of foods with yellow pigment, and pathological factors, such as infections and jaundice, can cause the baby’s tongue to turn yellow. 1. Physiological factors: when consuming foods containing yellow pigment, such as yellow-fleshed watermelon, carrots, pumpkin, etc., can cause infants’ tongues to turn yellow, but this color change is usually temporary and can be restored after a period of time. 2. Pathological factors: when infants have jaundice, the total bilirubin concentration in the blood will increase, showing the symptoms of yellow tongue; infants with serious infections, such as pneumonia, can also cause the tongue to turn yellow. There may also be other reasons for the yellowing of the tongue in infants, so it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.