Adequate nutrition and normal development of the fetus during pregnancy can promote fetal hair and black, in addition to nutritional factors also genetic factors. Pregnant mother’s diet during pregnancy needs to be nutritionally comprehensive, pay attention to the intake of high-quality protein such as lean meat, eggs, milk, etc., at the same time pay attention to vitamins and trace elements, such as fresh fruits and vegetables, walnuts, black sesame and other nutrients, which are helpful for the development of the fetus and the growth of fetal hair. The state of fetal hair is not only related to the diet of pregnant women, but also related to heredity and other factors, if the parents have more and darker hair, the child’s hair will generally be better.