First of all, yellow hair is a possibility of zinc deficiency, but fatty acids or iron deficiency can also cause yellow hair in children, and there are also genetic factors that can cause this phenomenon to occur. If it is a genetic factor that causes a decrease in the production and utilization of melanin, this is normal and not something to worry about. However, if it is caused by malnutrition, we should actively look for the cause of malnutrition, adjust the child’s diet structure, and correct nutrient and trace element deficiencies. It is best to go to the hospital to check the trace elements, to determine whether the child is zinc or iron deficiency, to carry out the corresponding treatment. There is also a possibility that the child’s hair is yellow due to improper use of shampoo. Therefore, it is recommended that babies aged 1-3 years old, it is best to use shampoos for children.