If your child is experiencing cold-like symptoms that last longer than 10 to 14 days or recur frequently, he or she may be suffering from a chronic sinus infection known as sinusitis. This is a common condition that affects millions of Americans every year. Your child’s doctor can run tests to verify that allergies or other diseases aren’t to blame and will prescribe a treatment plan that may include antihistamines, decongestants, saline drops, antibiotics or surgery.