The causes of yellow hair in infants include genetic factors, which are normal and do not require any treatment; pathological factors include malnutrition, phenylketonuria, etc. Different treatments need to be given according to different diseases, such as zinc supplementation and low-phenylalanine diet. 1. Genetic factors: most of the yellow hair of infants is related to genetic factors, if the parents have yellow hair when they were young, the infants will also have yellow hair after birth, which is a normal situation and does not need any treatment. 2. Zinc supplement: If the baby is picky about food or partiality, there may be malnutrition resulting in zinc deficiency, clinical manifestations of anorexia, inactivity, pallor, yellow hair and other phenomena, in addition to complementary dietary diversification, but also to give zinc supplementation treatment at the same time. 3. Low phenylalanine diet: Phenylketonuria is an autosomal recessive hereditary disease. Symptoms begin to appear at the age of 3-6 months, mainly manifested as yellow hair, white skin and mental anomalies, etc. Diagnosed infants need to be given low phenylalanine milk powder, and the concentration of phenylalanine is detected on a regular basis. There are many reasons for yellowing of hair in infants, it is recommended to consult a doctor in time to identify the cause and give corresponding treatment or treatment.