The dry and itchy skin of a three-year-old baby may be related to seasonal dermatitis, micronutrient deficiencies, and infections. It is recommended to pay attention to hydration and moisturizing, and if necessary, give antihistamines, glucocorticoids, vitamins, anti-infection, anti-virus drug treatment. 1. Seasonal dermatitis: Seasonal dermatitis is related to the change of seasons, climate change and other factors. If you are allergic to pollen, dust, animal dander, it may lead to dry and itchy skin. It is recommended to get out of the environment, pay attention to hydration, and give drugs such as hydrocortisone butyrate and loratadine when necessary, which can help relieve symptoms. 2. Micronutrient deficiency: children’s itchy skin, but also to understand whether with long-term partiality, picky eating led to micronutrient deficiency, caused by itchy skin. It is recommended to increase the intake of fresh vegetables and fruits, and if necessary, supplement a variety of trace elements, can help improve. 3. Bacterial, viral and fungal infections: dry and itchy skin, but also to understand whether it is related to viral, bacterial and fungal infections. Viral infections cause itching, can be given, acyclovir, glycerite lotion to help relieve. Bacterial infections that cause itching may be given erythromycin, fusidic acid ointment, and amoxicillin. Fungal infections can be treated by giving ketoconazole ointment and miconazole nitrate ointment. To summarize, the causes of dry skin and itching in babies are more, it is recommended to go to the dermatology department of the hospital, combined with the doctor’s advice to give treatment.