5 months baby head itchy old scratching head, may be physiological reasons, such as dry scalp caused by, can reduce the frequency of shampooing, change the shampoo way to relieve. It may also be due to pathological reasons, such as seborrheic dermatitis, seasonal allergies, skin diseases, etc. Treatment includes medication, treatment of primary diseases, etc., and should be treated in accordance with medical advice. 1. physiological reasons: 5 months baby head itchy old scratching head may be caused by dry scalp. Some parents will give the baby to use a stronger oil shampoo, in the removal of scalp surface oil at the same time, the skin barrier of the scalp has also caused a certain impact. Parents need to pay attention to reduce the frequency of shampooing, and replace it with a milder shampoo. 2. Pathological causes: (1) seborrheic dermatitis: 5 months old baby head itchy old scratching head may be seborrheic dermatitis, the disease is affected by a variety of factors, including the mental emotional state, sleep, sebum secretion and so on. Parents can follow the doctor’s instructions on the baby to use medication, such as glucocorticoids and so on. (2) seasonal allergies: 5 months old baby head itchy old scratching head may be seasonal allergies, scalp itching is just the body allergies in the local performance of one. Parents should try to screen the baby allergens, try to avoid the baby contact allergens, at the same time, follow the doctor’s instructions to the baby using medication, such as ebastine. (3) skin diseases: 5 months baby head itchy old scratching head may be caused by skin diseases, such as dermatitis, eczema, psoriasis, tinea capitis, urticaria and other diseases. Should promptly go to the hospital, and actively treat the primary disease. If the baby has uncomfortable symptoms, should promptly go to the hospital to avoid delay.