Inflammation in the sinuses, commonly known as sinusitis, can affect anyone, including children. Typically, symptoms of sinusitis in children resemble common colds, frequent runny nose, allergies, issues with the nasal septum, or nasal polyps. If left untreated, these symptoms can worsen and lead to complications. To alleviate sinusitis symptoms in children, here are some natural treatments you can apply:

1. Increase Water Intake
   Ensure that your child's water intake is sufficient to help thin mucus, making it easier to expel.
   
   
2. Warm Compress
   Applying a warm compress can help alleviate pain and liquefy mucus.
   
   
3. Use a Humidifier
   If needed, use a humidifier in your child's room or another area in the house. Humid air can relieve a stuffy nose.
   
   
4. Adequate Rest
   Sufficient rest aids in a quicker recovery from sinusitis.
   
   
5. Nasal Rinse or Saline Nasal Irrigation
   Nasal irrigation helps relieve a congested nose. You can spray saline solution or saltwater into your child's nose to flush the nasal passages.

Source: alodokter.com