Be alert to the development of allergic rhinitis and sinusitis when your child has recovered from a cold but has a runny nose. When a child has a viral infection, it most often manifests itself as a runny nose, nasal congestion and cough. Usually, it is normal for a child to start with a clear, watery nose, and then the baby’s nose will become stickier and even turn into pus a few days later. If your baby’s nasal discharge reverses, from pus to mucous, or then to clear, this condition indicates the occurrence of bacterial sinusitis. Allergic rhinitis can make your child’s nose run all the time, so you should take your child to the hospital for a relevant examination to clarify the diagnosis and then treat the symptoms. You can take antibiotic medication, during the antibiotic medication, you should observe the child’s various symptoms in time, usually the child’s symptoms will be slightly relieved. However, if there is no relief within 3 days or it is getting heavier, it means that the bacteria infecting the baby is likely to be resistant to this antibiotic and the use of antibiotics should be adjusted as soon as possible.