Most of the newborn hair loss is physiological alopecia, do not need treatment, as long as the new hair grows out naturally will get better. 1, the newborn’s fetal hair is brought out from the mother’s body, after birth most of the hair follicles in a few days from the growth phase to the resting phase quickly, generally after 9 to 12 weeks, the baby’s hair follicles will re-form the hair bulb, and then grow new hair. Newborns sleep more, sleeping just due to the pressure generated by the weight of the head, can make the baby’s occipital produce a large area of hair loss. These are physiologic alopecia. 2, pathologic alopecia to calcium deficiency is common, rickets in addition to hair loss is often accompanied by other symptoms, such as crying, easy to wake up from sleep, excessive sweating and so on. As the occipital area is stimulated by sweat, babies often shake their heads and pillow friction during sleep, resulting in occipital hair thinning, loss, the formation of typical occipital ring alopecia, is the early manifestation of infantile rickets. Because the growth and development of the baby after birth is very fast, it is easy to calcium deficiency, so in order to prevent the occurrence of calcium deficiency, it is recommended that we should drip cod liver oil from 15 days after birth, and start calcium supplementation at 6 months or earlier to 1 month, and keep supplementing until about 2 years old. Pay attention to keep the head clean and wipe it in time after sweating, so that the newborn’s hair loss will be very little.