Cold and nasal congestion in a 3-month-old baby is usually recommended to be treated through life interventions and the use of medications. Active treatment of upper respiratory tract infections is also needed. 1. life intervention: 3 months baby cold nasal congestion is usually recommended to let the baby to ensure adequate milk, open the windows and ventilation, increase indoor humidity. 2. the use of drugs: 3 months baby cold nasal congestion can also use saline nasal cleaning, if the symptoms of nasal congestion affect the baby’s sleep can also use fumarole nasal drops and other drugs to shrink the nasal mucosal blood vessels, reduce the nasal mucosal edema oozing, for treatment. 3. treatment of primary diseases: if diagnosed with upper respiratory tract infection, but also need to treat the cause of the disease, such as the consideration of upper respiratory tract infection, but also improve the blood test to assist in the diagnosis, according to the results of the adjustment of the use of drugs, such as the combination of bacterial infections can be used to treat drugs such as cefadroxil. 3 months baby cold nasal congestion recommended early standardized treatment, in order to reduce the adverse effects of the disease. All of the above medication should be used under the guidance of a doctor, avoid self-medication.