One and a half year old babies always say nipple itch may be infected factors, allergies, eczema and other factors. 1. Infection factors: do not pay attention to the nipple area skin cleaning, resulting in nipple area dirt increased, easy to cause infection, there will be nipple itching symptoms, may also be accompanied by redness, tingling and other symptoms. 2. Allergy: For example, wearing chemical fiber underwear, excessive friction on the nipple area may cause nipple allergy, which will cause itching, accompanied by redness. 3. Eczema: may be related to environmental factors, genetic factors, immune factors, when the child’s nipple area eczema, there will be symptoms of intense itching, localized red papules. One and a half year old baby always say nipple itch may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.