In the medulla and cortical cells of normal hair, there are melanin granules which determine the color of the hair. The keratinocytes in the hair get their nutrition from the papilla of the hair, and any factor that affects the supply of nutrients to the papilla of the hair affects the growth of melanin, and thus the color of the hair. In addition, the level of human nutrition affects the division of hair matrix cells, thus, the speed of hair matrix cell division directly affects the density, growth rate and quality of hair. Low nutrition level or even severe malnutrition, over time, will lead to hair withering, or even fall off. It can be seen that thinning hair in young children is not a disease, and the good or bad of the hair has a lot to do with the baby’s nutritional level. To let the baby have thick black good hair, first of all to ensure that young children have enough nutrition, in the diet to increase some of the food containing iron, zinc, calcium more, such as milk and milk products, beans, vegetables, shrimp, calcium content are higher. Liver, meat, fish, greens, amaranth, spinach, leeks, etc. contain more iron. In addition, the application of iron tableware has iron supplementation. If there is a habit of partiality, you should try to correct it. Shave the child’s hair in the infant stage, this practice is extremely harmful. Because the infant shaved head is very easy to cause trauma. Infant scalp injury, due to the lower resistance to disease, easy to make bacteria invade the scalp, causing scalp inflammation or folliculitis, thus affecting the growth of hair.