Four-month infant nasal congestion if the nasal cavity inflammation caused by the available physiological sea saline nasal spray, if it is a foreign body can be used to remove the endonasal endoscopy and so on. 1. Nasal inflammation: such as allergic rhinitis, colds caused by nasal mucosal congestion, turbinate enlargement, resulting in nasal inflammation, can cause nasal congestion in babies, accompanied by sneezing, sneezing, runny nose symptoms, in this case, you can use physiological sea saline nasal spray to rinse nasal secretions, nasal congestion seriously affects the breastfeeding, the use of fumarole nasal drops to relieve nasal congestion, etc., the use of drugs need to comply with the doctor’s instructions. 2. Nasal foreign body: baby’s age is easy to toilet paper, small particles of toy parts and other inadvertent sent into the nasal cavity, causing symptoms of nasal congestion. This situation needs to be timely to the hospital ear, nose and throat through the ring nasal needle, nasal endoscopy and other tools to remove the foreign body, in order to achieve the role of relief of nasal congestion. Nasal congestion in four-month-old infants should be treated under the guidance of a doctor.