To determine whether a baby has rhinitis, you can use symptoms, physical examination and blood sampling. 1. Symptoms: Babies with rhinitis may have symptoms such as nasal congestion, runny nose, sneezing, sore throat and discomfort, high fever, fatigue and loss of appetite. As babies are small, they may also show scratching of the nose and tearing of the eyes. 2. Physical examination: If parents are unable to judge by themselves, they can go to the hospital and ask a professional doctor to observe the mucous membrane in the nasal cavity with an endoscope or a simple anterior rhinoscope. If the mucous membrane in the nasal cavity is congested and swollen, combined with the baby’s symptoms, the baby may have rhinitis. 3. Blood sampling: If the baby has a sudden paroxysmal cough, mainly dry cough or even asthma, it may be allergic rhinitis asthma syndrome. At this time, in addition to the nasal speculum examination can also take the baby to the hospital through the blood for allergen testing, improve the sinus CT, observe whether there is adenoid hypertrophy and so on to determine. If the infant has symptoms of rhinitis, parents are advised to go to the hospital in time to get a clear diagnosis, and under the guidance of the doctor, take the appropriate treatment plan.