To determine whether your baby has rhinitis, you can judge from the clinical symptoms, such as whether there is repeated rubbing of the nose, picking of the nose or the nose is not ventilated, and whether there is open-mouth breathing during sleep.
If a 4-month-old baby has a frequent runny nose, and not in the case of a cold, there will be repeated seepage of nasal mucus, and also accompanied by sneezing, repeated nose picking, rubbing the nose, especially in the sleep of open-mouth breathing and other related symptoms, it may suggest that the baby suffers from rhinitis.
So if parents can not judge at home whether the baby has rhinitis, you can bring the baby to the hospital for relevant examinations, after the cause of the disease and active symptomatic treatment, but taking into account the age of the 4-month-old baby is relatively small, generally do not do nasopharyngoscopy, the general practitioner will be based on the clinical symptoms of the initial judgment.