Two-year-old baby hair loss may be physiological factors, there may be a lack of trace elements, skin diseases, etc., should be timely consultation to identify the cause. 1. Physiological factors: such as children are born after the fetal hair, with the increase in age, because the child’s metabolism is more vigorous, the hair also needs to be metabolized, this fetal hair will gradually fall off, will grow out of the new hair, this situation is not to be nervous. 2. Lack of trace elements: may be due to unbalanced nutritional intake in the daily diet, anorexia, picky eaters, partiality and so on, resulting in the lack of trace elements (such as zinc deficiency), when the 2-year-old baby lack of zinc, there will be hair loss. 3. Skin diseases: it may be that 2-year-old babies have skin diseases on the scalp, such as seborrheic dermatitis or fungal infections, such as ringworm, which can also lead to hair loss. This symptom alone is not enough to diagnose the disease, and may be caused by other factors. It is recommended that the patient consult a doctor to clarify the cause of the disease and give targeted treatment.