Sinusitis (Sinus Infection) in Children

This is an inflammation and swelling of your child's sinuses. What are sinuses? They're a system of spaces lined with mucous membranes. They drain into the nose's nasal passages. There are four types of sinuses, but they don't all develop at the same time. We're born with two, near the nose and cheeks. The other two form by the end of adolescence.