Hair loss in infants may be caused by physiological hair loss, calcium deficiency, lack of trace elements and so on. 1. Physiological hair loss: after a newborn baby is born, there is often a phenomenon of fetal hair falling off on its own, this is due to the hair follicles have to go through the resting period before entering the growth period, which is a normal physiological phenomenon. 2. Calcium deficiency: when infants are deficient in calcium, it is easy to cause hair loss phenomenon, mainly manifested as occipital baldness, but also accompanied by excessive sweating during sleep, easy to wake up during sleep and other symptoms. 3. Lack of micronutrients: when infants lack micronutrients, such as zinc, it is also easy to cause hair loss, and may be accompanied by loss of appetite, weight loss and other symptoms. If the baby hair loss accompanied by other symptoms should be promptly to the hospital examination, a clear diagnosis of targeted treatment.