In general, babies with allergies need about 3-7 days to recover, depending on the cause of their allergy and the severity of their condition. Allergies in babies are often caused by diet, exposure to external substances and other factors, and can manifest as red dots or red spots on the skin, some of which are accompanied by significant itching symptoms. Babies may also experience abnormalities such as vomiting and refusal of milk during breastfeeding. Usually, babies are especially sensitive to allergic foods, so you need to avoid allergens, avoid seafood, beef and mutton and spicy and irritating foods, and try to eat a light diet. Secondly, it is also necessary to avoid contact with allergy-prone things, such as pollen, smoke and dust. Once allergies are detected, the baby should go to the pediatrician in time to clarify the cause and treat the symptoms, which can gradually recover in about one week with effective treatment, but the specific situation depends on the patient’s condition. In addition, babies with allergies should not be scratched to avoid skin breakage and aggravation. It is recommended that anti-allergy medication be used under the guidance of a doctor, and parents should not blindly administer medication on their own.